#include "iostream"
#include "cmath"
#include "algorithm"
#include "string"
#include "vector"
using namespace std;

int n ;
string s;

void input(){
	cin >> s;
}

void output() {
	cout << s << endl ;
}



int main()
{

	input();

	n = s.size();

	for (int i = 0; i < n; i++) {
		int a = i + 1;
		while ( s[i] - a < 'A') {
			a -= 26 ;
		}
		
		s[i] = s[i] - a ;

	}

	output();

    return 0;
}