why!!!

#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c,d;
	cin>>a>>b>>c>>d;
	if(d==a) cout<<"A";
	else if(d==b) cout<<"B";
	else if(d==c) cout<<"C";
	else if(a==b||a==c||b==c) cout<<"Report";
	else if(d!=a&&d!=b&&d!=c) if(a>b>c) cout<<"B"; if(c>a>b) cout<<"A"; if(a>c>b) cout<<"C";
}