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()
{
    char s[1000];
    int i,l,j,c1=0,c2=0;
    gets(s);
    l=strlen(s);
    for(i=0;i<l;i++)
    {
        if(s[i]=='h')
            c1++;
        if(s[i+1]=='i')
            c2++;
    }
   // printf("%d %d",c1,c2);
    if(c1==c2)
        printf("Yes\n");
    else
        printf("No\n");
}