#include<bits/stdc++.h>
#define ll long long
#define ull unsigned long long
using namespace std;
const int maxlen=6e4+9;
char chr[maxlen],ma[10]={'h','o','r','s','e','x'};
int len,tmp=0,ans=0,cnt=0; 
int main(){
    freopen("horsesnum.in","r",stdin);
    freopen("horsesnum.out","w",stdout);
    char a;
    while(scanf("%c",&a)!=EOF){
        if(a>='a'&&a<='z') chr[++cnt]=a;
        if(a>='A'&&a<='Z') chr[++cnt]=a-'A'+'a';
    }
    for(int i=1;i<=cnt;i++){
        if(chr[i]==ma[tmp]){
            tmp++;
            if(tmp>=5){
                if(chr[i+1]=='s') ans+=2,i++;
				else ans++;
				tmp=0;
            }
        }
        else if(chr[i]==ma[0]) tmp=1;
        else tmp=0;
    }
    printf("%d\n",ans);
    return 0;
}