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 JavaScript (node.js v5.12) (judge verdict: Wrong Answer)

'use strict'

const Main = (input) => {
  const S = input.split('\n')[0]
  if (S.length % 2 == 1) {
  	console.log('No')
  } else {
  	const n = S.length / 2
    for (let i = 0; i < n; i++) {
      if ((S[2 * i] == 'h') && (S[2 * i + 1] == 'i')) {
      	if (i == n - 1) {
          console.log('Yes')
        }
      } else {
        console.log('No')
      }
    }
  }
}

Main(require('fs').readFileSync('/dev/stdin', 'utf8'))