#include <bits/stdc++.h>

using namespace std;

int main() {
	pair<int, string> hx[3];

	hx[0].second = "A";
	hx[1].second = "B";
	hx[2].second = "C";
	cin >> hx[0].first;
	cin >> hx[1].first;
	cin >> hx[2].first;

	sort(hx, hx+3);
	reverse(hx, hx+3);

	cout << hx[0].second << endl;
	cout << hx[1].second << endl;
	cout << hx[2].second << endl;

	return 0;
}