#include <iostream>
using namespace std;
struct X{
	int h;
	int w;
	X(int H,int W){
		h=H;
		w=W;
	}
	bool operator>(X &x){
		if (h>x.h){
			return true;
		}else if (h==x.h){
			return w<x.w;
		}
		return false;
	}
};

int main(int argc, char* argv[])
{
	int Ha,Wa;
	int Hb,Wb;
	int Hc,Wc;


	cin>>Ha>>Wa;
	cin>>Hb>>Wb;
	cin>>Hc>>Wc;
	X x1(Ha,Wa);
	X x2(Hb,Wb);
	X x3(Hc,Wc);
	
	if (x1>x2 && x1>x3){
		//Max
		cout<<"A"<<endl;
	}else if (x2>x1 && x3>x1){
		//Min
		cout<<"C"<<endl;
	}else{
		cout<<"B"<<endl;
	}

	if (x2>x1 && x2>x3){
		//Max
		cout<<"A"<<endl;
	}else if (x1>x2 && x3>x2){
		//Min
		cout<<"C"<<endl;
	}else{
		cout<<"B"<<endl;
	}

	if (x3>x1 && x3>x2){
		//Max
		cout<<"A"<<endl;
	}else if (x1>x3 && x2>x3){
		//Min
		cout<<"C"<<endl;
	}else{
		cout<<"B"<<endl;
	}

	return 0;
}