import java.util.*; class No0013{ public static void main(String[] args){ Scanner sc = new Scanner(System.in); String s = sc.next(); char[] st = new char[s.length()]; int res = 0; for(int i = 0; i < s.length(); i++){ st[i] = s.charAt(i); res = (int)(st[i] - i + 1); while(res < 'A'){ res += 26; } st[i] = (char)res; System.out.print(st[i]); } System.out.println(); } }