#include<iostream>

using namespace std;

int main(void)
{
  string s; cin>>s;
  int s_size=0;
  
  while(s[s_size]){s_size++;}
  
  for(int i=0;i<s_size;i++){
    s[i]=s[i]-(i+1);
    for(int j=0;j<40;j++){
      if(s[i]<'A'){s[i]+=26;}
    }
  }
  
  cout<<s<<endl;
  
  return 0;
}