#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#include <functional>
#include <map>
#include <iomanip>
#include <math.h> 
#include <stack>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <tuple>
#include <cctype>
#include <ctype.h>
#include <set>
#include <sstream>

using namespace std;


int main() {
	int i, j, k;   
	vector<pair<int, char>>a(3);


	a[0].second = 'A';
	a[1].second = 'B';
	a[2].second = 'C';


	cin >> a[0].first;
	cin >> a[1].first;
	cin >> a[2].first;

	sort(a.begin(), a.end());

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

	getchar();
	getchar();
	return 0;
}