#include <iostream>
#include <string>
using namespace std;

int main () {
  string a;
  int sum = 5;
  cin >> a;
  for ( int i = 0; i < a.size (); i++ ) {
    if( sum <= a[i]-'a' ){
        int aux = sum;
        sum = a[i] - 'a';
        a[i] = a[i] - aux;
    }
    else {
      int aux = sum;
      sum = a[i] - 'a';
      a[i] = a[i] + 26 - aux;
    }
    }
   cout << a;
  }