#include <bits/stdc++.h>

using namespace std;

struct Character {
    char name;
    int height;
    int weight;
};

bool cmp(const Character &a, const Character &b) {
    if (a.height != b.height) {
        return a.height > b.height;
    } else {
        return a.weight < b.weight;
    }
}

int main() {
    vector<Character> vt(3);
    int h, w;
    for (int i = 0; i < 3; ++i) {
        cin >> h >> w;
        vt[i].name = (char) 'A' + i;
        vt[i].height = h;
        vt[i].weight = w;
    }

    sort(vt.begin(), vt.end(), cmp);
    for (int i = 0; i < 3; ++i) {
        cout << vt[i].name << endl;
    }
    return 0;
}