#include <bits/stdc++.h>

using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define rep1(i,n) for(int i=1;i<=n;i++)
typedef long long ll;

int main() {
  string s;
  cin >> s;
  rep(i,s.size()){
    if(s[i]-(i+1)>90)s[i]=s[i]-(i+1)-26;
    else s[i]=s[i]-(i+1);
  }
  cout << s << endl;
}