#include <iostream>
using namespace std;
int main(int argc, char* argv[])
{
	int Ha,Hb,Hc;
	cin>>Ha;
	cin>>Hb;
	cin>>Hc;
	int maxH=max(Ha,max(Hb,Hc));
	int minH=min(Ha,min(Hb,Hc));	
	if (Ha==maxH){
		cout<<"A"<<endl;
	}else if(Ha==minH){
		cout<<"C"<<endl;
	}else{
		cout<<"B"<<endl;
	}
	if (Hb==maxH){
		cout<<"A"<<endl;
	}else if(Hb==minH){
		cout<<"C"<<endl;
	}else{
		cout<<"B"<<endl;
	}
	if (Hc==maxH){
		cout<<"A"<<endl;
	}else if(Hc==minH){
		cout<<"C"<<endl;
	}else{
		cout<<"B"<<endl;
	}
	return 0;
}