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

class Program
{
    static void Main(string[] args)
    {
        var list = new List<int>();
        for (int i=0; i < 3; i++)
        {
            list.Add(int.Parse(Console.ReadLine()));
        }

        var dic = new Dictionary<string, int>()
        {
            { "A", list[0] },
            { "B", list[1] },
            { "C", list[2] }
        };

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