#include "bits/stdc++.h"

using namespace std;

#define FOR(i, j, k) for(int i = j; i < k; ++i)
#define rep(i, j) FOR(i, 0, j)
#define FORr(i, j, k) for(int i = j; i >= k; --i)
#define repr(i, j) FOR(i, j, 0)
#define INF (1 << 30)

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> P;
typedef pair<P, int> Pi;

const int MOD = 1000000007;
const int dy[] = { 0, 0, 1, -1 };
const int dx[] = { 1, -1, 0, 0 };

template <class T> void chmin(T& a, const T& b) { a = min(a, b); }
template <class T> void chmax(T& a, const T& b) { a = max(a, b); }
int gcd(int a, int b) { return (a % b == 0) ? b : gcd(b, a % b); }

int main() {
	string s;
	cin >> s;
	rep(i, s.size()) {
		int tmp = (i + 1) % 26;
		if (s[i] - tmp < 'A') {
			tmp = tmp - (s[i] - 'A') - 1;
			s[i] = 'Z' - tmp;
		}
		else s[i] -= tmp;
		cout << s[i];
	}
	cout << "\n";
	return 0;
}