#include <bits/stdc++.h>
using namespace std;

int main(){
  string s;cin >>s;
  
  if(s.size()%2)cout << "No" << endl;
  else{
    bool ok = true;
    
    for(int i=0; i<s.size(); i++){
      if(i%2==0 && s[i]!='h'){
        ok = false;
        break;
      }
      if(i%2==1 && s[i]!='i'){
        ok = false;
        break;
      }
    }
    if(ok)cout << "Yes" << endl;
    else cout << "No" << endl;
  }
  return 0;
}
#include <iostream>
#include <fstream>
#include <set>
#include <map>
#include <string>
#include <vector>
#include <queue>
#include <deque>
#include <stack>
#include <functional>
#include <algorithm>
#include <climits>
#include <cmath>
#include <iomanip>
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000


int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    string S; cin >> S;
    if(S.length() == 3)
        reverse(S.begin(), S.end());
    cout << S << endl;

    return 0;
}
