It seems like the year of 2013 came only yesterday. Do you know a curious fact? The year of 2013 is the first year after the old 1987 with only distinct digits.

Now you are suggested to solve the following problem: given a year number, find the minimum year number which is strictly larger than the given one and has only distinct digits.
The single line contains integer *y* (1000 ≤ *y* ≤ 9000) — the year number.
#include<iostream>
using namespace std;
int main()
{
    int num,f,s,t,fo;
    cin>>num;
    while(true){
        num+=1;
        f=num/1000;
        s=num/100 %10;
        t=num/10 %10;
        fo=num%10;
        if(f!=s && f!=t && f!=t && f!=fo && s!=t && s!=fo && t!=fo){
            cout<<num;
            return 0;
    }
    return 0;

    }
   
}