#include <iostream>
#include<string>
using namespace std;

int main() {
	string s;
	cin>>s;
	for(int i=0;i<s.length();i++)
	{
		s[i]-=(i+1)%26;
		if(s[i]<'A')s[i]+='Z'-'A'+1;
	}
	cout<<s<<endl;
	return 0;
}