use std::io::{read_to_string, Write};

use proconio::input_interactive;

fn main() {
    input_interactive!(alpha: String);

    let mut prev = alpha.repeat(2);
    loop {
        println!("? {}", prev.chars().rev().collect::<String>());
        std::io::stdout().flush().unwrap();

        let line = read_to_string(std::io::stdin()).unwrap();
        let mut line = line.split_whitespace();

        let symbol = line.next().unwrap().parse::<char>().unwrap();

        if symbol == '!' {
            break;
        }

        let t = line.next().unwrap();
        prev = t.to_string();
    }
}