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

namespace YukiCoder
{
	public class Brother
	{
		public static void Main()
		{
			

			Dictionary<string, List<int>> BroDic = new Dictionary<string, List<int>>()
			{
				{"A",new List<int>{int.Parse(Console.ReadLine()),int.Parse(Console.ReadLine())}},
				{"B",new List<int>{int.Parse(Console.ReadLine()),int.Parse(Console.ReadLine())}},
				{"C",new List<int>{int.Parse(Console.ReadLine()),int.Parse(Console.ReadLine())}},
			};

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

	


	}
}