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(void){
    char str[11];
    scanf("%s",str);
    if(strlen(str)%2){
        puts("No");
        return 0;
    }
    for(int i = 0;i < strlen(str);i+=2){
        if(str[i] != 'h'){
            puts("No");
            return 0;
        }
        if(str[i+1] != 'i'){
            puts("No");
            return 0;
        }
    }
    puts("Yes");
    return 0;
}