#include<iostream>
#include<string>
#include<algorithm>
#include<cctype>
#include<set>
#include<bitset>
#include<math.h>
#include<map>
#include<queue>
#include<iomanip>
using namespace std;
#ifdef _WIN32
#include <Windows.h>
#endif

bool comp(const vector<int> &alpha, const vector<int> &beta){
    if (alpha[0] == beta[0]) return alpha[1] < beta[1];
    else return alpha[0] > beta[0];
}

int main()
{
    vector<vector<int>> v(3, vector<int> (3));
    for (int i = 0; i < 3; i++){
        cin >> v[i][0] >> v[i][1];
        v[i][2] = 'A' + i;
    }
    sort(v.begin(), v.end(), comp);
    for (auto x : v){
        cout << (char)x[2] << endl;
    }
}