#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <stdio.h>
#include <cstring>
#include <queue>
#include <stack>
#include <functional>
#include <math.h>
#include <iomanip>
using namespace std;
#define Would
#define you
const int INF = 999999999;
const int MOD = 1e9 + 7;
const double pi = 3.141592653589793238;

int main() {
	int a = 1;
	string h;
	cin >> h;
	for (char s : h) {
		s -= 'A', s = s - a + 26, s %= 26;
		cout << (char)(s + 'A');
		a = (a + 1) % 26;
	}
	cout << endl;
}