#include<iostream>
#include<string>
#include<string.h>
#include<algorithm>
#include<stdio.h>
#include<cmath>
#include<vector>
#include<utility>
#include<stack>
#include<queue>
#include<list>
#include<bitset>

#define FOR(i, a, b) for(int i=(a);i<=(b);i++)
#define RFOR(i, a, b) for(int i=(a);i>=(b);i--)
#define MOD 1000000007
#define INF 1000000000

using namespace std;


int main(void) {
	string s;

	cin >> s;
	FOR(i, 0, s.size() - 1) {
		int p;
		FOR(t, 1, 26) {
			if (s[i] == 'A' + t - 1) {
				p = t;
				break;
			}
		}
		p -= (i + 1);
		if (p % 26 == 0) {
			p = 26;
		}
		else {
			p %= 26;
		}
		if (p < 0) {
			p = 26 + p;
		}
		s[i] = 'A' + p - 1;
	}
	cout << s << endl;
	return 0;
}