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: Runtime Error)

function checkHitachi(S) {
 
    //hihi, hiii, dadahi, dahiida
 
    let pass = true;
 
    S.split('hi').forEach((v) => {
        if (v.length > 0) {
            pass = false;
        }
    })
 
    return pass;
}
 
 
function checkTest() {
 
    let pass = true;
    if (checkHitachi('ha') !== false) {
        pass = false;
    }
    if (checkHitachi('hii') !== false) {
        pass = false;
    }
    if (checkHitachi('hihi') !== true) {
        pass = false;
    }
    if (checkHitachi('hi') !== true) {
        pass = false;
    }
 
    return pass;
    
}


function main() {
  
	if (checkTest()) {
      return 'Yes';
    } else {
      return 'No';
    }
}