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: Wrong Answer)

#include <bits/stdc++.h>
using namespace std;
int main(void){
    string s;
    cin>>s;
    int flag=0;
    for (int i=0;i<s.size();i++) {
        if (s[i]=='h'&&i+2<s.size()) {
            if (s[i+1]=='i'&&s[i+2]!='i') {
                cout<<"Yes"<<endl;
                flag=1;
                break;
            }
        }
    }
    if (flag==0) {
        cout<<"No"<<endl;
    }
}