#define _USE_MATH_DEFINES

#include <iostream>	//cin, cout
#include <vector>	//vector
#include <algorithm> //sort,min,max,count
#include <string>	//string,getline
#include <ios>		//fixed
#include <iomanip>	//setprecision
#include <utility> //swap, pair
#include <cstdlib>	//abs(int)
#include <cmath>	//sqrt,ceil,M_PI, pow, sin
#include <sstream>	//stringstream,getline
#include <numeric>	//gcd, accumlate
#include <deque>	//deque

using namespace std;

int main() {

	vector<pair<int, string>> 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;

	return 0;

}