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

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

			Dictionary<string, int> BroDic = new Dictionary<string, int>()
			{
				{"A",int.Parse(Args[0])},
				{"B",int.Parse(Args[1])},
				{"C",int.Parse(Args[2])},
			};

			foreach (var Value in BroDic.OrderByDescending(x => x.Value))
			{
				Console.WriteLine(Value.Key);
			}
		}


	}
}