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 C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <bits/stdc++.h>
using namespace std;
int main(int argc, char const *argv[])
{
	string s;
	cin >> s;
	if (s.size() %2 != 0)
		cout << "No\n";
	else
	{
		int poss=1;
		for (int i = 0; i < s.size()/2; ++i)
		{
			if (s[i*2]!='h' || s[i*2+1] != 'i')
			{
				poss = 0;
				break;
			}
		}
		if (!poss)
			cout << "No\n";
		else
			cout << "Yes\n";
	}
	return 0;
}