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(void){
    int i;
    char str[12];
    int swi=1;
    
    scanf("%s",str);
    
    for(i=0;i<strlen(str);i++){
        if(i%2==0){
            if(str[i]!='h')
            break;
        }
        if(i%2==1){
            if(str[i]!='i')
            break;
        }
        swi=0;
    }
    
    if(swi==0)
    printf("Yes\n");
    else
    printf("No\n");
    
    return 0;
}