#include <iostream>
using namespace std;

inline char add(char s, int k)
{
  int p = ('Z' - s) + 1;        // Aまでの距離
  if (p > k) return s + k;
  else return ('A' + (k - p));
}

int main()
{
  //string s;
  char s[1024];
  cin >> s;

  int i = 0;
  int k = 1;                    // ずらす数
  int p = 0;
  while (s[i] != '\0')
  {
    char s1 = s[i];
    int kk = k % 26;
    if (kk > 0) kk = 26 - kk;
    cout << add(s1, kk);
    i++;
    k++;
  }
  cout << endl;

  return 0;
}