#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef long double ld;
typedef pair<int, int> Pii;
typedef pair<int, ll> Pil;
typedef pair<ll, ll> Pll;
typedef pair<ll, int> Pli;
typedef vector<vector<ll>> Mat;
#define fi first
#define se second
const ll MOD = 1e9 + 7;
const ll MOD2 = 998244353;
const ll MOD3 = 1812447359;
const ll INF = 1ll << 62;
const double PI = 2 * asin(1);
void yes() { printf("yes\n"); }
void no() { printf("no\n"); }
void Yes() { printf("Yes\n"); }
void No() { printf("No\n"); }
void YES() { printf("YES\n"); }
void NO() { printf("NO\n"); }

int main() {
  string s;
  cin >> s;

  for (int i = 0; i < s.length(); i++) {
    char now = s[i];
    for (int j = 1; j <= i + 1; j++) {
      now--;
      if (!('A' <= now && now <= 'Z')) {
        now = 'Z';
      }
    }

    s[i] = now;
  }
  cout << s << endl;

  return 0;
}