#include<bits/stdc++.h>
using namespace std;
string s,si="",fi="horse";
int num=0;
int main()
{
	freopen("horsesnum.in","r",stdin);
    freopen("horsesnum.out","w",stdout);
    cin>>s;
    int le=s.length();
    for(int i=0;i<le;i++)
    {
        if((s[i]>='a')&&(s[i]<='z'))
        {
            si+=s[i];
        }
        if((s[i]>='A')&&(s[i]<='Z'))
        {
            si+=(char)(s[i]-'A'+'a');
        }
    }
    while(1)
    {
        int we=si.find(fi);
        if(we!=-1)
        {
            num++;
            if(si[we+5]=='s')num++;
            si=si.substr(we+5);
        }
        else
        {
            break;
        }
    }
    cout<<num;
	return 0;
}