fn main() {
    let s1: String = read();
    let s1 = s1.chars();

    let mut plane = String::new();

    let mut index = 1;
    let ascii_a = 'A' as u8;

    for c in s1 {
        let c_plane = (((c as u8) + 26 - ascii_a - index) % 26 + ascii_a) as char;
        plane.push(c_plane);
        index = (index + 1) % 26;
    }

    println!("{}", plane);
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}