#include <iostream>
#include <algorithm>
#include <vector>
#include <tuple>

void solve() {
    std::vector<std::tuple<int, int, char>> ts;
    for (int i = 0; i < 3; ++i) {
        int x, w;
        std::cin >> x >> w;
        ts.emplace_back(-x, w, 'A' + i);
    }

    std::sort(ts.begin(), ts.end());
    for (auto t : ts) std::cout << std::get<2>(t) << std::endl;
}

int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    solve();

    return 0;
}