using System.Linq;
using System;

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

public class Hello
{
    public static void Main()
    {
        var name = new char[] { 'A', 'B', 'C' };
        var ps = new P[3];
        for (int i = 0; i < 3; i++)
            ps[i] = new P { n = name[i], h = int.Parse(Console.ReadLine().Trim()) };
        foreach (var x in ps.OrderByDescending(y =>y.h))
            Console.WriteLine(x.n);
    }
}