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

namespace yukicoder_570 {
    class Program {
        static void Main(string[] args) {
            int[] h = new int[3];
            for(int i = 0; i < 3; i++) {
                h[i]=int.Parse(Console.ReadLine());
            }
            var map = new Dictionary<string, int>();
            map["A"] = h[0];
            map["B"] = h[1];
            map["C"] = h[2];
            foreach(var i in map.OrderByDescending((x)=>x.Value)) {
                Console.WriteLine(i.Key);
            }
            Console.ReadLine();
        }
    }
}