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 (Clang 3.8.0) (judge verdict: Wrong Answer)

#include<stdio.h>
#include<string.h>
int main(){
char S[10];
int len,a=0,b=0;
scanf("%s",S);
len = strlen(S);
for(int i=0;i<len;i=i+2){
	if(S[i]=="h")a=1;
	}
  for(int j=1;j<len;j=j+1){
  if(S[j]=="i")b=1;
  }
  if(a==1&&b==1)printf("Yes");
  else printf("No");
return 0;
}