#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <stdio.h>
#include <cstring>
#include <queue>
#include <stack>
#include <functional>
#include <math.h>
#include <iomanip>
using namespace std;
#define Would
#define you
const int INF = 999999999;
const int MOD = 1e9 + 7;

int a, b, c;
int main() {
	cin >> a >> b >> c;
	vector<pair<int, string>>v(3);
	v[0].first = a; v[0].second = "A";
	v[1].first = b; v[1].second = "B";
	v[2].first = c; v[2].second = "C";
	sort(v.rbegin(), v.rend());
	for (int i = 0; i < 3; ++i) { cout << v[i].second << endl; }
}