#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001

char pre(char c,int t){
	if(t==0)return c;
	if(c=='A')c = 'Z';
	else c--;
	return pre(c,t-1);
}

int main(){
	
	string s;
	cin>>s;
	
	rep(i,s.size()){
		s[i] = pre(s[i],i+1);
	}
	cout<<s<<endl;
	return 0;
}