A Hitachi string is a concatenation of one or more copies of the string `hi`.

For example, `hi` and `hihi` are Hitachi strings, while `ha` and `hii` are not.

Given a string S, determine whether S is a Hitachi string.

Constraints

* The length of S is between 1 and 10 (inclusive).
* S is a string consisting of lowercase English letters.

Input

Input is given from Standard Input in the following format:


S


Output

If S is a Hitachi string, print `Yes`; otherwise, print `No`.

Examples

Input

hihi


Output

Yes


Input

hi


Output

Yes


Input

ha


Output

No
#!/usr/bin/env python

from sys import stdin, stderr

def main():
   S = stdin.readline().strip()
   if (len(S) % 2) != 0:
      print('No')
      return 0
   for i in xrange(0, len(S), 2):
      if S[i:i+2] != 'hi':
         print('No')
         return 0
   print('Yes')

   return 0

if __name__ == '__main__': main()
