use proconio::input_interactive;

fn main() {
    input_interactive! {
        n:usize,
    }

    let mut t = vec![b'a'; n];
    for i in 0..n {
        let mut cnts = (0..25).map(|i| (0, i)).collect::<Vec<_>>();
        for j in 0..25 {
            t[i] = b'a' + j as u8;
            print!("? ");
            for ti in t.iter() {
                print!("{}", *ti as char);
            }
            println!();
            input_interactive! {
                m:usize,
            }

            cnts[j].0 = m;
        }

        cnts.sort();
        if cnts[24].0 != cnts[23].0 {
            t[i] = b'a' + cnts[24].1 as u8;
        } else {
            t[i] = b'z';
        }
    }

    print!("! ");
    for ti in t {
        print!("{}", ti as char);
    }
    println!();
}