#include<iostream>
#include<string>
#include<algorithm>
#include<utility>
using namespace std;
int main(void){
	string s;
	cin>>s;
	for(int i=0;i<s.size();i++)
		for(int j=0;j<i+1;j++){
			s[i]--;
			if(s[i]=='A'-1)s[i]='Z';
		}
	cout<<s<<endl;
}