using System;
using System.Linq;

class No571
{
    static void Main()
    {
        int[] better = new int[70];
        for (char i = 'A'; i < 'D'; ++i)
        {
            var ruler = Console.ReadLine().Split(' ').Select(x => Int32.Parse(x)).ToArray();
            ruler[1] = Math.Abs(100 - ruler[1]);
            better[i] = ruler[0] * 100 + ruler[1];
        }
        for (int i = 0; i < 3; ++i)
        {
            var index = Array.IndexOf(better, better.Max());
            Console.WriteLine((char)index);
            better[index] = 0;
        }
    }
}