#include <iostream>
#include <string>

using namespace std;

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