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>
int main(void)
{
    char H[10];
    int i;
    
    i = 0;
    scanf("%s", H);
    while (H[i])
        i++;
    if (i % 2 != 0 || i > 10 || i == 0)
        printf ("No");
    else
    {
        i = 0;
        while (H[i])
        {
            if (i % 2 == 0)
            {
                if (H[i] != 'h')
                {
                    printf ("No");
                    break ;
                }
            }
            else
            {
                if (H[i] != 'i')
                {
                    printf ("No");
                    break ;
                }
            }
            i++;
            if (H[i] == '\0')
                    printf("Yes");
        }
    }
    return (0);
}