#include<bits/stdc++.h>
using namespace std;
using Int = long long;
//INSERT ABOVE HERE
signed main(){
  string s;
  cin>>s;
  Int n=s.size();
  for(Int i=0;i<n;i++){
    for(Int j=0;j<=i;j++){
      if(s[i]=='A') s[i]='Z';
      else s[i]--;
    }
  }
  cout<<s<<endl;
  return 0;
}