#include<bits/stdc++.h>
#define rep(i,a,n) for (int i = a;i < n;i++)
using namespace std;

pair<pair<int,int>,char> A[3];
int main(){
    rep(i,0,3) {
        int a,b;
        cin>>a>>b;
        A[i]={{-a,b},'A'+i};
    }
    sort(A,A+3);
    rep(i,0,3){
        cout << A[i].second << endl;
    }
}