package main

import (
	"fmt"
	"strings"
)

func main() {
	var alp, S string
	alp = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
	fmt.Scan(&S)
	T := make([]string, 0, 1024)
	for i, s := range S {
		i++
		a := strings.IndexRune(alp, s)
		a -= i
		for a < 0 {
			a += 26
		}
		T = append(T, string(alp[a]))
	}
	woosaa := strings.Join(T, "")
	fmt.Println(woosaa)
}