AtCoder Inc. holds a contest every Saturday.

There are two types of contests called ABC and ARC, and just one of them is held at a time.

The company holds these two types of contests alternately: an ARC follows an ABC and vice versa.

Given a string S representing the type of the contest held last week, print the string representing the type of the contest held this week.

Constraints

* S is `ABC` or `ARC`.

Input

Input is given from Standard Input in the following format:


S


Output

Print the string representing the type of the contest held this week.

Example

Input

ABC


Output

ARC
import java.util.*;
class Main{  
 public static void main(String args[]){  
   Scanner sc=new Scanner(System.in);
   String s=sc.nextLine();
   String s1="ABC";
   if(s.equals(s1))
      System.out.println("ARC");
   else
      System.out.println("ABC");
      
      }
      
      }