use std::io::*;
use std::str::FromStr;

#[allow(dead_code)]
fn get_line() -> String {
    let stdin = stdin();
    let mut line = String::new();
    stdin.lock().read_line(&mut line).expect("io error.");
    line.trim().to_string()
}

#[allow(dead_code)]
fn get_word<T: FromStr>() -> T {
    (&get_line()).parse().ok().expect("parse error.")
}

#[allow(dead_code)]
fn get_vec<T: FromStr>() -> Vec<T> {
    (&get_line()).split(' ').map(|x| x.parse().ok().expect("parse error.")).collect()
}

fn main() {
    let s = get_line();
    let mut ans = String::new();
    for (i, c) in s.chars().enumerate() {
        ans.push(cycle(i, c));
    }
    println!("{}", ans);
}

fn cycle(i: usize, c: char) -> char {
    let uc = c as u32;
    let ua = 'A' as u32;
    let to = ((uc - ua + 26 * 100 - (i as u32 + 1)) % 26 + ua) as u8;
    to as char
}