At regular competition Vladik and Valera won a and b candies respectively. Vladik offered 1 his candy to Valera. After that Valera gave Vladik 2 his candies, so that no one thought that he was less generous. Vladik for same reason gave 3 candies to Valera in next turn.

More formally, the guys take turns giving each other one candy more than they received in the previous turn.

This continued until the moment when one of them couldn’t give the right amount of candy. Candies, which guys got from each other, they don’t consider as their own. You need to know, who is the first who can’t give the right amount of candy.

Input

Single line of input data contains two space-separated integers a, b (1 ≤ a, b ≤ 109) — number of Vladik and Valera candies respectively.

Output

Pring a single line "Vladik’’ in case, if Vladik first who can’t give right amount of candy, or "Valera’’ otherwise.

Examples

Input

1 1


Output

Valera


Input

7 6


Output

Vladik

Note

Illustration for first test case:

<image>

Illustration for second test case:

<image>

import java.awt.List;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.math.RoundingMode;
import java.util.*;

public class Watermelon {
	public static void main(String[] args) throws IOException{
		Main m=new Main();
		m.solve();
	}
	}
class Main{
	
	 BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
	 private int[] array;
	    private int[] tempMergArr;
	    private int length;
	
	    BigInteger[] temp=new BigInteger[31];
		BigInteger x,y,z;
	    StringTokenizer stringTokenizer;

	     String next() throws IOException {
	        while (stringTokenizer == null || !stringTokenizer.hasMoreTokens()) {
	            stringTokenizer = new StringTokenizer(reader.readLine());
	        }
	        return stringTokenizer.nextToken();
	    }

	    int nextInt() throws IOException {
	        return Integer.parseInt(next());
	    }

	    long nextLong() throws IOException {
	        return Long.parseLong(next());
	    }
	    int[] marr=null;
	    int[] arr=null;
	    int[][] lcsarr=null;
	    void solve() throws IOException  {
	    	int a=this.nextInt();int b=this.nextInt();
	    	int t=1;
	    	while(true){
	    		if(t%2!=0)
	    		{a-=t;if(a<0){System.out.println("Vladik");System.exit(0);}}
	    		else
	    		{b-=t;if(b<0){System.out.println("Valera");System.exit(0);}}
	    		
	    			
	    		t++;
	    	}
	    	}
	    void recurs(int[][] arr,int j,int x,int n){
	    		 
	    	
	    }
	    public static int[] recurs(int x,int[] arr){
	   //   System.out.println(x);
	    	if(x==-1)
	    	  return arr;
	      if(arr[x]<=arr[x+1])
	    	  {
	    	  recurs(x-1,arr);
	    	  return arr;
	    	  }
	      arr[x]-=1;
	      for(int i=x+1;i<arr.length;i++){
	  //  	  System.out.println(i+" i");
	    	  arr[i]=9;
	      }
	      recurs(x-1,arr);
	      return arr;
	    }
	    static int max_LIS=0;
	   
	    public int LIS(int[] arr,int n){
	    	if(n==0)
	    		{
	    		marr[0]=1;
	    		return 1;
	    		}
	    	
	    	int current =1;
	    	for(int i=0;i<n;i++){
	    		int subproblem=0;
	    		if(marr[i]==0)
	    		{
	    			subproblem=LIS(arr,i);
	    			marr[i]=subproblem;
	    		}
	    		else{
	    		//	System.out.println("Hey");
	    			subproblem=marr[i];
	    		}
	    		
	    		System.out.println(current+" "+subproblem+" "+i);
	    		if(arr[i]<arr[n]&&current<(1+subproblem)){
	    			current=(1+subproblem);
	    		}
	    	}
	    	if(max_LIS<current)
	    		max_LIS=current;
	    	return current;
	    }
	    public int LCS1(int i,int j){
	    	System.out.println(i+" "+j+"hey");
	    	int n=0;
	    	if(i==-1||j==-1)
	    		return 0;
	    	if(arr[i]==marr[j])
	    		n=1+LCS1(i-1,j-1);
	    	else{
	    		n=Math.max(LCS1(i-1,j), LCS1(i,j-1));
	    	}
	    	return n;
	    }
	    public int LCS(int i,int j){
	    	System.out.println(i+" "+j);
	    	int n=0;
	    	if(i==-1||j==-1)
	    		return 0;
	    	if(arr[i]==marr[j])
	    		{
	    		if(i!=0&&j!=0){
	    		if(lcsarr[i-1][j-1]==0){
	    		n=1+LCS(i-1,j-1);
	    		lcsarr[i-1][j-1]=n-1;
	    		}
	    		else{
	    			n=1+lcsarr[i-1][j-1];
	    		}
	    		}
	    	else
	    		n=1+LCS(i-1,j-1);
	    		}
	    	else{
	    		int x,y=0;
	    		if(i!=0){
	    		
	    		if(lcsarr[i-1][j]==-1)
	    		{
	    			x=LCS(i-1,j);
	    			lcsarr[i-1][j]=x;
	    		}
	    		else{
	    			x=lcsarr[i-1][j];
	    		}
	    		}
	    		else
	    			x=LCS(i-1,j);
	    		if(j!=0){
	    		if(lcsarr[i][j-1]==-1){
	    		y=LCS(i,j-1);
	    		lcsarr[i][j-1]=y;
	    		}
	    		else{
	    			y=lcsarr[i][j-1];
	    		}
	    		}
	    		else
	    			y=LCS(i,j-1);
	    		n=Math.max(x, y);
	    	}
	    	return n;
	    }
	public BigInteger comb(int n,int r){
	     x=this.temp[n];
		 y=this.temp[r];
		 z=this.temp[n-r];
	//	 System.out.println(x+" "+y+" "+z);
		 BigInteger ret=x.divide(y.multiply(z));
		 return ret;
		 
	}
	public void fact(){
		this.temp[0]=BigInteger.ONE;
		this.temp[1]=BigInteger.ONE;
		for(int i=2;i<this.temp.length;i++){
			temp[i]=(temp[i-1].multiply(BigInteger.valueOf(i)));
		}
	}
	private static int gcd(int a, int b)
	{
	    while (b > 0)
	    {
	    	int temp = b;
	        b = a % b; // % is remainder
	        a = temp;
	    }
	    return a;
	}
	private static int lcm(int a, int b)
	{
	    return a * (b / gcd(a, b));
	}
	static int[] toFractionPos(int x,int y){
		int a=gcd(x,y);
		int[] arr={x/a,y/a};
		//display(arr);
		return arr;
	}
   
	static void display(int[][] arr){
		for(int i=0;i<arr.length;i++){
			for(int j=0;j<arr[i].length;j++){
				System.out.print(arr[i][j]+" ");
		}
			System.out.println();
		}
		System.out.println();
	}

	 static void display(String[] arr){
			for(int i=0;i<arr.length;i++){
				System.out.println(arr[i]+" ");
			}	
			//System.out.println();
		
	 }
	 static void display(int[] arr){
		 for(int i=0;i<arr.length;i++)
				System.out.print(arr[i]+" ");
		System.out.println();
		 }
		 static void display(double[] arr){
		 	   for(int i=0;i<arr.length;i++){
		 		   System.out.print(arr[i]+" ");
		 	   }
		 	   System.out.println();
	    }
	 static void display(char[] arr){
		// System.out.println();
		 int t=0;
			for(int i=0;i<arr.length;i++){
				if(arr[i]!='0'){t=i;break;}
			}	
			while(t!=arr.length){
				System.out.print(arr[t]);
				t++;
			}
			System.out.println();
		
		  }
	 static String str(char[] carr){
		 String str="";
		 for(int i=0;i<carr.length;i++){
			    str=str+carr[i];
			}
		 return str;
	 }
	    public void sort(int inputArr[]) {
	        this.array = inputArr;
	        this.length = inputArr.length;
	        this.tempMergArr = new int[length];
	        doMergeSort(0, length - 1);
	    }
	 
	    private void doMergeSort(int lowerIndex, int higherIndex) {
	         
	        if (lowerIndex < higherIndex) {
	            int middle = lowerIndex + (higherIndex - lowerIndex) / 2;
	            // Below step sorts the left side of the array
	            doMergeSort(lowerIndex, middle);
	            // Below step sorts the right side of the array
	            doMergeSort(middle + 1, higherIndex);
	            // Now merge both sides
	            mergeParts(lowerIndex, middle, higherIndex);
	        }
	    }
	 
	    private void mergeParts(int lowerIndex, int middle, int higherIndex) {
	 
	        for (int i = lowerIndex; i <= higherIndex; i++) {
	            tempMergArr[i] = array[i];
	        }
	        int i = lowerIndex;
	        int j = middle + 1;
	        int k = lowerIndex;
	        while (i <= middle && j <= higherIndex) {
	            if (tempMergArr[i] <= tempMergArr[j]) {
	                array[k] = tempMergArr[i];
	                i++;
	            } else {
	                array[k] = tempMergArr[j];
	                j++;
	            }
	            k++;
	        }
	        while (i <= middle) {
	            array[k] = tempMergArr[i];
	            k++;
	            i++;
	        }
	 
	    }
}


 class  Count implements Comparable {
    	    Integer i;
    	    Integer j;
            Integer k;
    	    Count(int i,int j){
    	        this.j=j;
    	        this.i=i;
    	        this.k=i;
    	    }
    	    void display(){
    	    	System.out.println(i+" "+j+" "+k);
    	    }
    	    
    	    	@Override
    		public int compareTo(Object o) {
    			// TODO Auto-generated method stub
    			Count c=(Count)o;
    			if(i.compareTo(c.i)>0)
    				return 1;
    			else if(i.compareTo(c.i)<0)
    				return -1;
    			else{
    				return 0;
    				
    			}
    		}
    		
    	}

 class  Counti implements Comparable {
    	    Integer i;
    	    int j;
    	    int k;
    	    Counti(int i,int j,int k){
    	        this.j=j;
    	        this.i=i;
    	        this.k=k;
    	    }
    	    void display(){
    	    	System.out.println(i+" "+j+" "+k);
    	    }
    	    
    	    	@Override
    		public int compareTo(Object o) {
    			// TODO Auto-generated method stub
    			Counti c=(Counti)o;
    			if(i.compareTo(c.i)>0)
    				return 1;
    			else if(i.compareTo(c.i)<0)
    	    		return -1;
    			else
    				return 0;
    		}
    		
    	}
		
 class Extra{
	 ArrayList<Integer> list=new ArrayList<>();
	 Extra(int i){
		 list.add(i);
	 }
	 void display(){
		 System.out.println(list.size());
		 for(int i=0;i<list.size();i++){
			 System.out.print(list.get(i)+" ");
		 }
		 System.out.println();
	 }
 }