#include <iostream>
using namespace std;

int main(){
	int a,b,c;
	cin >> a >> b >> c;
	if(a>b && a>c){cout << "A\n";
		if(b>c) cout << "B\nC\n";else cout << "C\nB\n";
	}else if(b>a && b>c){cout << "B\n";
		if(a>c) cout << "A\nC\n"; else cout << "C\nA\n";
	}else{cout << "C\n";
		if(a>b) cout << "A\nB\n"; else cout << "B\nA\n";}
	return 0;
}