using System;
using System.Linq;
using System.Collections.Generic;

public class yukicoder
{
    public static void Main()
    {
		string[] bro = new string[]{"A", "B", "C"};
		List<int> Height = new List<int>();
		List<int> Weight = new List<int>();
		
		for(int i = 0; i <= 2; i++)
		{
			int[] work = Console.ReadLine().Split(' ').Select(x => int.Parse(x)).ToArray();
			Height.Add(work[0]);
			Weight.Add(work[1]);
		}

		
		for(int j = 0; j <= bro.Length - 2; j++)
		{
    		for(int i = 0; i <= bro.Length - 2; i++)
    		{
    		    bool swap = false;
    		    if(Height[i] < Height[i + 1])
    		    {
    		        swap = true;
    		    }
    		    else if(Height[i] == Height[i + 1] && Weight[i] > Weight[i + 1])
    		    {
    		        swap = true;
    		    }
    		    
    			if(swap)
    			{
    				string temp1 = bro[i];
    				bro[i] = bro[i + 1];
    				bro[i + 1] = temp1;
    				
    				int temp2 = Height[i];
    				Height[i] = Height[i + 1];
    				Height[i + 1] = temp2;
    				
    				int temp3 = Weight[i];
    				Weight[i] = Weight[i + 1];
    				Weight[i + 1] = temp3;
    			}
    		}
		}
		
		bro.ToList().ForEach(x => Console.WriteLine(x));
    }
}