#include <bits/stdc++.h>
using namespace std;
int main()
{
    int height, weight;
    pair<pair<int, int>, char> p[3];
    for (int i = 0; i < 3; i++) {
        cin >> height >> weight;
        p[i] = {{-height, weight}, 'A'+i};
    }
    sort(p, p+3);
    for (int i = 0; i < 3; i++) cout << p[i].second << endl;
    return 0;
}