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

namespace YukiCoder
{
	public class Brother
	{
		public static void Main()
		{
			string[] A = Console.ReadLine().Split(' ');
			string[] B = Console.ReadLine().Split(' ');
			string[] C = Console.ReadLine().Split(' ');

			Dictionary<string, List<int>> BroDic = new Dictionary<string, List<int>>()
			{
				{"A",new List<int>{int.Parse(A[0]),int.Parse(A[1])}},
				{"B",new List<int>{int.Parse(B[0]),int.Parse(B[1])}},
				{"C",new List<int>{int.Parse(C[0]),int.Parse(C[1])}},
			};

			foreach (var Value in BroDic.OrderByDescending(x => x.Value[0]).ThenBy(x => x.Value[1]))
			{
				Console.WriteLine(Value.Key);
			}
		}

	


	}
}