#include "bits/stdc++.h"
using namespace std;
#define fastcin {\
    cin.tie(0);\
    ios::sync_with_stdio(false);\
}
#define rep(i, a, b) for(int i = a; i < b; i++)

struct Brother {
    char n;
    int h, w;
    bool operator<(const Brother& another) const {
        if(h!=another.h) {
            return h > another.h;
        }
        if(w!=another.w) {
            return w < another.w;
        }
        return n < another.n;
    }
};

int main() {
    fastcin;
    vector<Brother> b;
    char name[3] = {'A', 'B', 'C'};
    rep(i, 0, 3) {
        Brother in;
        in.n = name[i];
        cin >> in.h >> in.w;
        b.push_back(in);
    }
    sort(b.begin(), b.end());
    rep(i, 0, 3) printf("%c\n", b[i].n);
    return 0;
}