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