use std::io::*;

fn main() {
    let mut s = String::new();
    stdin().read_line(&mut s).ok();
    let ss = s.trim().chars().collect::<Vec<char>>();

    let t = "abcdefghijklmnopqrstuvwxyz";
    let tt = t.trim().chars().collect::<Vec<char>>();

    for i in 0..tt.len() {
        if ss[i] != tt[i] {
            println!("{}to{}", tt[i], ss[i])
        }
    }
}