#include <bits/stdc++.h>

#define show(x) cerr << #x << " = " << x << endl

using namespace std;
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;

template <typename T>
ostream& operator<<(ostream& os, const vector<T>& v)
{
    os << "sz=" << v.size() << "\n[";
    for (const auto& p : v) {
        os << p << ",";
    }
    os << "]\n";
    return os;
}

template <typename S, typename T>
ostream& operator<<(ostream& os, const pair<S, T>& p)
{
    os << "(" << p.first << "," << p.second
       << ")";
    return os;
}


constexpr ll MOD = 1e9 + 7;

template <typename T>
constexpr T INF = numeric_limits<T>::max() / 100;

struct Person {
    ll height;
    ll weight;
    char c;
    bool operator<(const Person& p) const
    {
        return (height != p.height) ? height > p.height : weight < p.weight;
    }
};

int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    vector<Person> brother(3);
    for (int i = 0; i < 3; i++) {
        cin >> brother[i].height >> brother[i].weight;
        brother[i].c = 'A' + i;
    }
    sort(brother.begin(), brother.end());
    for (const auto& p : brother) {
        cout << p.c << endl;
    }
    return 0;
}