#include "bits/stdc++.h"

using namespace std;

using ll = long long int;
using ld = long double;

using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vvvl = vector<vvl>;
using vd = vector<double>;
using vvd = vector<vd>;
using vb = vector<bool>;
using vvb = vector<vb>;
using vs = vector<string>;

const int INF = (1 << 30) - 1;
const ll INF64 = ((ll)1 << 62) - 1;
const double PI = 3.1415926535897932384626433832795;

const int dx[] = { -1, 0, 1, 0 };
const int dy[] = { 0, 1, 0, -1 };

int gcd(int x, int y) { return y ? gcd(y, x % y) : x; }
ll gcd(ll x, ll y) { return y ? gcd(y, x % y) : x; }
int lcm(int x, int y) { return x / gcd(x, y) * y; }
ll lcm(ll x, ll y) { return x / gcd(x, y) * y; }

using ei1333 = struct {
	string name;
	int h;
	int w;
};

vector<ei1333> solve(int n, vector<ei1333> izryt) {
	vector<ei1333> res = izryt;

	bool flag = true;
	for (int i = 0; flag; i++) {
		flag = false;
		for (int j = n - 1; j >= i + 1; j--) {
			if (res[j].h < res[j - 1].h) {
				swap(res[j], res[j - 1]);
				flag = true;
				continue;
			}
			
			if (res[j].h == res[j - 1].h && res[j].w > res[j - 1].w) {
				swap(res[j], res[j - 1]);
				flag = true;
				continue;
			}
		}
	}

	return res;
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	vector<ei1333> izryt(3);
	vs names = { "A", "B", "C" };
	for (int i = 0; i < izryt.size(); i++) {
		int h, w;
		cin >> h >> w;

		izryt[i].name = names[i];
		izryt[i].h = h;
		izryt[i].w = w;
	}

	vector<ei1333> res = solve(3, izryt);
	for (int i = res.size() - 1; i >= 0; i--) {
		cout << res[i].name << endl;
	}
	return 0;
}