#include <iostream>
#include <vector>
#include <string>
#include <array>
#include <queue>
#include <deque>
#include <set>
#include <list>
#include <map>
#include <stack>
#include <utility>
#include <algorithm>
#include <numeric>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <cctype>
#include <cstring>
#include <climits>
#include <bitset>
#include <random>
#include <functional>
#include <sstream>
#include <iomanip>

using namespace std;

#define _CRT_SECURE_NO_WARNINGS
#define REP(i, n) for(int i=0; i<(n); i++)
#define FOR(i, m, n) for(int i=(m);i<(n);i++)
#define SZ(x) ((int)(x).size())
#define SORT(x) sort((x).begin(),(x).end())
#define REVE(x) reverse((x).begin(),(x).end())
#define MP make_pair
#define PB push_back

typedef vector<int> VI;
typedef vector<string> VS;
typedef vector<vector<int>> VVI;
typedef pair<int, int> PII;
typedef long long LL;

int main(){
	//A -> 65	Z->90
	string s;
	cin >> s;
	int size = SZ(s);
	VI a;
	REP(i, size) {
		a.PB((int)(s[i]));
		a[i] -= i + 1;
	}
	REP(i, size) {
		int x = a[i];
		if (x < 65) {
			x += (65 - x + 26 - 1) / 26 * 26;
		}
		else if (x > 90) {
			x -= (x - 90 + 26 - 1) / 26 * 26;
		}
		a[i] = x;
	}
	REP(i, size) {
		cout << (char)a[i];
	}
	puts("");
}