#define _USE_MATH_DEFINES

#include <iostream>		//cin, cout
#include <vector>		//vector
#include <algorithm>	//sort,min,max,count
#include <string>		//string,getline, to_string
#include <cstdlib>		//abs(int)
#include <utility>		//swap, pair
#include <deque>		//deque
#include <climits>		//INT_MAX
#include <bitset>		//bitset
#include <cmath>		//sqrt, ceil. M_PI, pow, sin
#include <ios>			//fixed
#include <iomanip>		//setprecision
#include <sstream>		//stringstream
#include <numeric>		//gcd, assumlate
#include <random>		//randam_device
#include <limits>		//numeric_limits

using namespace std;
constexpr long long int D_MOD = 1000000007;

int main() {

	int a, b, c;
	cin >> a >> b >> c;

	if (a < b) {
		if (b < c) {
			cout << "C\nB\nA" << endl;
		}
		else {
			if (a < c) {
				cout << "B\nC\nA" << endl;
			}
			else {
				cout << "B\nA\nC" << endl;
			}
		}
	}
	else {
		if (a < c) {
			cout << "C\nA\nB" << endl;
		}
		else {
			if (b < c) {
				cout << "A\nC\nB" << endl;
			}
			else {
				cout << "A\nB\nC" << endl;
			}
		}
	}

	return 0;

}