#include<iostream>
#include <malloc.h>
#include<string>
using namespace std;
int main(){

	string alph = "ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZ";
	string s;
	cin>>s;
	for(int i=0;i<s.size();i++){
	
		int a=s[i];
		a-=i+1;
		
		if(a<65){
			while(a<65){
				a+=26;
			}
		}
		cout<<alph[a-65];
		
	}
	cout<<endl;
	return 0;
}