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(){
    char s[11];
    int r=9;
    scanf("%s", s);
    if (s[0]=='h' && strlen(s)%2==0){
        for (int i=1; i<strlen(s); ++i){
            if (i%2!=0){
                if (s[i]=='i'){
                    r+=0;
                }else{
                    r=20;
                    break;
                }
            }else{
                if (s[i]=='h'){
                    r+=0;
                }else{
                    r=20;
                    break;
                }
            }
        }
    }else{
        r=20;
    }
    if (r==20){
        printf("No\n");
    }else if(r==9){
        printf("Yes\n");
    }
    return 0;
}