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: Wrong Answer)

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

int main(){
    char s[11];
    char hi[3] = "hi";
    int i;

    scanf("%s", s);
    if (strlen(s) == 1){
        printf("No");
        return 0;
    }

        for (i = strlen(s) - 2; i >= 0; i -= 2)
        {
            if (strcmp(&s[i], hi) == 0)
            {
                printf("Yes");
                //printf("No");
                return 0;
            }
            s[i] = '\0';
        }
    printf("No");

    return 0;
}