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>
int main(void){
    char s[11];
    int i;
    scanf("%s\n",s);
    int len,x=0;
    for(len=0;s[len]!='\0';len++);
    if(len%2==1){
	printf("No\n");
	return 0;
	}
    for(i=0;i<len/2;i++){
	if(s[i*2]!='h')x++;
	if(s[i*2+1]!='i')x++;
	}
    if(x==0)printf("Yes\n");
    else printf("No\n");

    return 0;
}