use std::io;
use std::io::prelude::*;
use std::io::BufReader;

fn run(args: &Vec<String>) -> Vec<String> {
    let ref s = args[0];

    let ca = 'A' as u32;
    let cz = 'Z' as u32;
    let a = cz - ca + 1;

    let cs = s
        .chars().enumerate()
        .map(|(i, c)| {
            let c1 = (c as u32) - ca;
            let c2 = (c1 + a - (i as u32) % a - 1) % a;
            (c2 + ca) as u8
        })
        .collect();
    vec!(String::from_utf8(cs).unwrap())
}

fn main() {
    let args = lines(BufReader::new(io::stdin()));
    for line in run(&args) {
        println!("{}", line);
    }
}

fn lines<R: Read>(reader: BufReader<R>) -> Vec<String> {
    reader.lines().map(|l| l.unwrap()).collect()
}