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) =>{
   let xs = input.trim().split('');
   let len = xs.length;
   let ans = 0;

    for(let i =0; i<len; i++) {
       if(xs[i]=='h' && xs[i+1]=='i' && xs[i+2]!='i') {
       	ans+=1;
       }else if(xs[i]=='i' && xs[i+1]=='i'){
        ans = 0;
       } else {
        ans+=0;
       }
    }
    if(ans>=1){
    console.log('Yes');
    }else{
    console.log('No');
    }
}
Main(require('fs').readFileSync('/dev/stdin','utf8'));