import std;

void main () {
    // 末尾を必ずαにしたら勝てる
    char a = readln.chomp.to!char;
    writefln("? %s%s", a, a);

    while (true) {
        auto input = readln.split;
        if (input[0] == "!") break;

        auto S = input[1];
        writefln("? %s%s", S[1], a);
        stdout.flush;
    }
}

void read (T...) (string S, ref T args) {
    import std.conv : to;
    import std.array : split;
    auto buf = S.split;
    foreach (i, ref arg; args) {
        arg = buf[i].to!(typeof(arg));
    }
}