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<iostream>
#include<string>

int main(void){
    std::string s;
    std::cin >> s;
    std::string ans="Yes";
    int strlen = s.length();
    if(strlen < 2) ans = "No";
    for(int i =0; i<strlen; i++){
        if(i%2 == 0 && s[i] != 'h'){
            //std::cout << s[i];
            ans ="No";
            break;
        }else if(i%2 == 1 && s[i] != 'i'){
            //std::cout << s[i];
            
            ans = "No";
            break;
        }
    }

    std::cout << ans << std::endl;

    return 0;
}