#include <bits/stdc++.h>
using namespace std;

int Comp( const int H0, const int W0,
		const int H1, const int W1 )
{
	if( H0 < H1 )
		return  - 1;
	else if( H0 > H1 )
		return 1;

	if( W0 < W1 )
		return  1;
	else if( W0 > W1 )
		return - 1;

	return 0;
}

int main()
{
int HA;
int HB;
int HC;
int WA;
int WB;
int WC;

	cin >> HA;
	cin >> WA;
	cin >> HB;
	cin >> WB;
	cin >> HC;
	cin >> WC;

	if( Comp( HA, WA, HB, WB ) > 0 )
	{
		if( Comp( HC, WC, HB, WB ) < 0 )
		{
			cout << "A" << endl;
			cout << "B" << endl;
			cout << "C" << endl;
			
			return 0;
		}
		
		if( Comp( HA, WA, HC, WC ) > 0 )
		{
			cout << "A" << endl;
			cout << "C" << endl;
			cout << "B" << endl;
			
			return 0;
		}
		else
		{
			cout << "C" << endl;
			cout << "A" << endl;
			cout << "B" << endl;
			
			return 0;
		}
	}

	if( Comp( HC, WC, HB, WB ) > 0 )
	{
		cout << "C" << endl;
		cout << "B" << endl;
		cout << "A" << endl;
		
		return 0;
	}
	
	if( Comp( HA, WA, HC, WC ) > 0 )
	{
		cout << "B" << endl;
		cout << "A" << endl;
		cout << "C" << endl;
		
		return 0;
	}
	else
	{
		cout << "B" << endl;
		cout << "C" << endl;
		cout << "A" << endl;
		
		return 0;
	}

	return 0;
}