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: Accepted)

function Main(input) {
	input = input.split("");
	var flag = true;
	if(input.length%2==1) flag = false;
	for(var i=0;i<input.length/2;i++){
		if(input[i*2]=="h"&&input[i*2+1]=="i"){
			
		}else{
			flag = false;
		}
		if(!flag){
			break;
		}
	}
if(flag){
	console.log("Yes")
}else{
	console.log("No")
}
}Main(require("fs").readFileSync("/dev/stdin", "utf8").trim());