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(void)
{
  char S[11];
  char A[11]="";
  char B[3]="hi";
  int i;
  int flag=0;
  scanf("%s",S);
  for(i=0;i<5;i++){
  	if(strcmp(S,A)==0){
      flag=1;
      break;
    }
    else{
      strcat(A,B);
    }
  }
  if(flag==0){
    printf("No");
  }
  else{
    printf("Yes");
  }
  return 0;
}