#include <bits/stdc++.h>

using namespace std;

#define REP(i, n) for(int i = 0; i < n; i++)

int main() {
    pair<pair<int, int>, char> a[3];

    int h, w;
    REP(i, 3) {
        cin >> h >> w;
        h = 200 - h;
        a[i].first = make_pair(h, w);
        a[i].second = 'A' + i;
    }

    sort(a, a + 3);
    REP(i, 3) {
        cout << a[i].second << endl;
    }

    return 0;
}