#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <iostream>
#include <map>
#include <list>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <queue>
#include <iomanip>
#define INF 1050000000

using namespace std;


string decode(string s)
{
	for (int i = 0; i < s.length(); i++) {
		s[i] -= (i + 1) % 26;
		if (s[i] < 'A') {
			s[i] += 26;
		}
	}

	return (s);
}

int main(void)
{
	string S;
	
	cin >> S;

	cout << decode(S) << endl;
}