#include <bits/stdc++.h>
using namespace std;
void rc(char &a) {
  a = 0;
  register int x = getchar_unlocked();
  while (x < 'a' || x > 'z') {
    if (x == '\n') {
      a = '0';
      return;
    }
    x = getchar_unlocked();
  }
  a = x;
}
const int maxn = 100100;
int key;
int main() {
  ios_base::sync_with_stdio(0);
  string ans = "";
  char cur;
  while (true) {
    rc(cur);
    if (cur == '0') break;
    if (cur == 'a') {
      if (key == 0)
        ans += "a";
      else if (key == 1) {
        ans += "a";
        key = 2;
      } else {
        ans += "a";
      }
    } else {
      if (key == 1)
        ans += (cur - 1);
      else if (key == 0) {
        ans += (cur - 1);
        key = 1;
      } else {
        ans += cur;
      }
    }
  }
  if (key == 0) {
    ans = ans.substr(0, ans.size() - 1) + "z";
    cout << ans << '\n';
    return 0;
  }
  cout << ans << '\n';
}
