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()
{
    int len,judge=0;
    char arr[10];
    scanf("%s",arr);
    len=strlen(arr);

    if(arr[0]=='h'&&len%2==0){   
        for(int i=0;i<=len-2;i=i+2){
            if(arr[i]!='h'||arr[i+1]!='i'){
                judge=1;
                break;
            }
        }
        if(judge==1) printf("No");
        else printf("Yes");
    }

    else printf("No");

    return 0;
}