#include <bits/stdc++.h>
using namespace std;
const long long INF = 2000000000;
const long long mod = 1000000007;
char a[100100];
int main() {
  scanf("%s", a);
  int n = strlen(a);
  int s = 0;
  while (a[s] == 'a') {
    if (s == n - 1) break;
    s++;
  }
  int e = n;
  for (int i = s + 1; i < n; i++) {
    if (a[i] == 'a') {
      e = i;
      break;
    }
  }
  for (int i = 0; i < n; i++) {
    if (s <= i && i < e)
      printf("%c", (a[i] - 'a' + 25) % 26 + 'a');
    else
      printf("%c", a[i]);
  }
}
