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(){
    int l;
    char s[10];
    char s1[10] = "hi";
    char s2[10] = "hihi";
    char s3[10] = "hihihi";
    char s4[10] = "hihihihi";
    char s5[10] = "hihihihihi";

    scanf("%s",s);

    l = strlen(s);

    if(strcmp(s,s1) == 0){
        printf("Yes\n");
    }else if(strcmp(s,s2) == 0){
        printf("Yes\n");
    }else if(strcmp(s,s3) == 0){
        printf("Yes\n");
    }else if(strcmp(s,s4) == 0){
        printf("Yes\n");
    }else if(strcmp(s,s5) == 0){
        printf("Yes\n");
    }else{
        printf("No\n");
    }
    return 0;
}