#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 123;
char s[N];
char prev(char c) { return c == 'a' ? 'z' : (char)(c - 1); }
int main() {
  scanf("%s", s);
  int n = strlen(s);
  int left = 0;
  while (left + 1 < n && s[left] == 'a') {
    left++;
  }
  int right = left;
  while (right + 1 < n && s[right + 1] != 'a') {
    right++;
  }
  for (int i = 0; i < n; i++) {
    if (left <= i && i <= right) {
      printf("%c", prev(s[i]));
    } else {
      printf("%c", s[i]);
    }
  }
  printf("\n");
  return 0;
}
