using System.Linq;
using System;

public class P
{
    public char n { get; set; }
    public int h { get; set; }
    public int w { get; set; }
}

public class Hello
{
    public static void Main()
    {
        var name = "ABC";
        var ps = new P[3];
        for (int i = 0; i < 3; i++)
        {
            string[] line = Console.ReadLine().Trim().Split(' ');
            var h = int.Parse(line[0]);
            var w = int.Parse(line[1]);
            ps[i] = new P { n = name[i], h = h, w = w };
        }
        foreach (var x in ps.OrderByDescending(y => y.h).ThenBy(y => y.w))
            Console.WriteLine(x.n);
    }
}