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

    let mut res = String::with_capacity(chs.len());
    for i in 0..chs.len() {
        let mut ch = chs[i] as u8;
        for _ in 0..(i as u32 % 26 + 1) {
            ch -= 1;
            if ch == 64 {
                ch = 90;
            }
        }
        res.push(ch as char);
    }
    println!("{}", res);
}