#include <iostream>
using namespace std;


int main()
{
	int a, b, c;
	cin >> a, b, c;
	if (a < b < c) {
		cout << "C" << "B" << "A" << endl;

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

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

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

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

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

		}


	



    return 0;
}