using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var list = new List<(char name, int h, int w)>();
        for (var i = 0; i < 3; ++i)
        {
            var c = NList;
            list.Add(((char)('A' + i), c[0], c[1]));
        }
        list.Sort((l, r) =>
        {
            var d = r.h.CompareTo(l.h);
            if (d != 0) return d;
            return l.w.CompareTo(r.w);
        });
        WriteLine(string.Join("\n", list.Select(li => li.name)));
    }
}