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>
#include<stdlib.h>

int main(void){
char s[100];
scanf("%s",s);
for(int i=0;s[i]!='\0';i++){
    if(i%2==0){
        if(s[i]!='h'){printf("No\n");return 0;}
    }
    else{
        if(s[i]!='i'){printf("No\n");return 0;}
    }
    if(s[i]!='h'&&s[i]!='i'){printf("No\n");return 0;}
    if(s[strlen(s)-1]!='i'){printf("No\n");return 0;}
}

printf("Yes\n");
}