#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <map>
#include <set>
#include <queue>
#include <iomanip>
#include <cstring>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long ll;
#define rep(i,n) for (int i = 0; i < int(n);i++)
using mint = modint1000000007;


int main(){
  string s;
  cin >> s;
  int n = s.size();
  for (int i = 0; i< n;i++){
    int diff = int(s[i]-'A');
    diff += 26-i-1;
    diff %= 26;
    s[i] = char('A'+diff);
  }
  cout << s << endl;
  
  return 0;
}