Problem:
Score : 100 points

Problem Statement

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.

Sample Input 1

hihi

Sample Output 1

Yes

hihi is the concatenation of two copies of hi, so it is a Hitachi string.

Sample Input 2

hi

Sample Output 2

Yes

Sample Input 3

ha

Sample Output 3

No

Solution in Ruby (2.3.3) (judge verdict: Accepted)

c = gets.chomp.to_s

if c.size == 2 && c == 'hi'
  puts 'Yes'
elsif c.size == 4 && c == 'hihi'
  puts 'Yes'
elsif c.size == 6 && c == 'hihihi'
  puts 'Yes'
elsif c.size == 8 && c == 'hihihihi'
  puts 'Yes'
elsif c.size == 10 && c == 'hihihihihi'
  puts 'Yes'
else
  puts 'No'
end