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 Go (1.14.1) (judge verdict: Accepted)

package main
 
import (
  "fmt"
  "strings"
)
 
func main() {
  var s string
  fmt.Scanf("%s", &s)
  
  ans := "No"
  if strings.Replace(s, "hi", "", -1) == "" {
    ans = "Yes"
  }
  fmt.Printf("%s\n", ans)
}