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++14 (GCC 5.4.1) (judge verdict: Accepted)

#include<bits/stdc++.h>
#define ll long long 
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;
signed main(){
  ll n=0,a;
  string s;
  cin>>s;
  if(s=="hi"){
    cout<<"Yes\n";
    return(0);
  }else if(s.size()%2==0){
    a=s.size();
  for(int i=0;i<s.size();i+=2){
      if(s[i]=='h' && s[i+1]=='i'){
       n++;
      }
    }
  if(n==a/2){
  cout<<"Yes\n";
  }else{
    cout<<"No\n";
  }
  }else{
    cout<<"No\n";
    return(0);
  }

  return(0);
}