#include <bits/stdc++.h>
#define rep(i,n) for(int i=0; i<(n); i++)
using namespace std;
typedef long long ll;

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