#include <bits/stdc++.h>
using namespace std;

int main(){
    string str = "ABC";
    vector <pair <pair <int, int>, char>> v;
    int in1, in2, i = 0;

    while(cin >> in1 >>in2){
        v.push_back({{in1, in2}, str[i++]});
    }
    sort(v.begin(), v.end(), [&](pair <pair <int, int>, char> x, pair <pair <int, int>, char> y){
        if(x.first.first != y.first.first){
            return x.first.first > y.first.first;
        }else{
            return x.first.second < y.first.second;
        }
    });
    for(i = 0; i < v.size(); i++){
        cout << v[i].second << endl;
    }

    return 0;
}