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 (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>
#include <string.h>

int main() {
    
    char d[11];
    int v = 0;
    
    scanf("%s", d);
    
    for (int i=0; i<strlen(d); i = i + 2) {
        if (d[i] != 'h' || d[i+1] != 'i') {
            v = 0;
            break;
        }
        
        if (d[i] == 'h' && d[i+1] == 'i')
            v = 1;
    }

    if (v == 1)
        printf("%s\n", "Yes");
    else 
        printf("%s\n", "No");

    return 0;
}