#include <iostream>
#include <string>
using namespace std;
int main(int argc, char* argv[])
{
	string S;
	cin>>S;
	int i;
	for (i=0;i<S.length();i++){
		char ch;
		for (int j=1;j<=i+1;j++){
			ch=S[i]-1;
			if (ch<'A'){
				ch='Z';
			}
			S[i]=ch;
		}
	}
	cout<<S<<endl;
	return 0;
}