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 Python (3.4.3) (judge verdict: Runtime Error)

import S

j_S = 'hi'
j_b = ['a','i','o','u','e']

if not j_S in S:
    print('No')    
else:
    i = 0
    for in_b in j_b:
        j_S_b = j_S + in_b
        if j_S_b in S:
            i+=1
    if i==0:
        print('Yes')
    elif i > 0:
        print('No')