use proconio::input_interactive;
use proconio::marker::Chars;

#[allow(non_snake_case)]
fn main() {
    input_interactive! {
        a: char,
    }
    println!("? {}{}", a, a);
    for _ in 0..100 {
        input_interactive! {
            (f, b): (char, Chars),
        }
        if f == '!' {
            break;
        }
        println!("? {}{}", b[1], a);
    }
}