use std::io::Read;
fn f(i: usize, c: char) -> char {
    let x = c as u32;
    let y = 'A' as u32;
    let z = ((x - y + 2600 - (i as u32 + 1)) % 26 + y) as u8;
    z as char
}
fn main() {
    let mut s = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let s: &str = s.trim().split('\n').next().unwrap().trim();
    let mut t = String::new();
    for (i, c) in s.chars().enumerate() {
        t.push(f(i, c));
    }
    println!("{}", t);
}