#include <bits/stdc++.h>
using namespace std;
string a;
string b;
string aim1,aim2;
int ans=0;
int main()
{
    freopen("horsesnum.in","r",stdin);
    freopen("horsesnum.out","w",stdout);
    cin>>a;
    int lb=0;
    b="";
    aim1="horse";
    aim2="horses";
    
    int la=a.length();
    //cout<<la;
    for(int i=0;i<la;i++)
    {//cout<<endl<<i<<' '<<a[i];
        if(a[i]>='a'&&a[i]<='z')
        {
            b=b+a[i];
            
        }
        else
        {
            if(a[i]>='A'&&a[i]<='Z')
            {
                char h=a[i]-'A'+'a';
                b=b+h;
            }
        }
    }
    lb=b.length();
    for(int i=0;i<lb;i++)
    {
        //cout<<i<<' '<<b[i]<<endl;
        if(b[i]=='h')
        {
            
            if(b.substr(i,6)==aim2)
            {
                //cout<<i<<"->2"<<endl;
                ans=ans+2;
                i=i+5;
            }
            else
            {
                if(b.substr(i,5)==aim1)
                {
                    //cout<<i<<"->1"<<endl;
                    ans++;
                    i=i+4;
                }
            }
        }
    }
    cout<<ans<<endl;
    return 0;
}