using System;

public class Hello
{
    static void Main()
    {
        var s = Console.ReadLine().Trim();
        getAns(s);
    }
    static void getAns(string s)
    {
        Console.WriteLine("? {0}a", s);
        while (true)
        {
            string[] line = Console.ReadLine().Trim().Split(' ');
            if (line[0] == "!" && line[1] == "WIN") return;
            if (line[0] == "?")
            {
                var t = line[1][1];
                Console.WriteLine("? {0}a", t);
            }
        }
    }
}