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

namespace YukiCoder
{
    class Program
    {
        static void Main(string[] args)
        {
            var la = new List<int>();
            for (int i = 0; i < 3; i++)
            {
                var va = Console.ReadLine().Split().Select(int.Parse).ToArray();
                la.Add((va[0] - 150) << 16 | (100 - va[1]) << 8 | i);
            }
            var vb = la.OrderByDescending(a => a).ToList();
            vb.ForEach(n => Console.WriteLine((Char)('A' + (n & 0xF))));
            Console.ReadLine();
        }
    }
}