#include <cstdio>
#include <stdio.h>
#include <stdlib.h>
 
using namespace std;
 
int tot,ans,p;
char s[100001],cc[10] = {'h','o','r','s','e','\n'};
 
inline void read(){
	register char c = getchar();
	while (1){
		if ((c >= 'a') && (c <= 'z')) s[++tot] = c;
		if ((c >= 'A') && (c <= 'Z')) s[++tot] = c - 'A' + 'a';
		if (c == EOF || c == '\n') return ;
		c = getchar();
	}
}
 
int main(){
	freopen("horsesnum.in","r",stdin);
	freopen("horsesnum.out","w",stdout);
	read();
	for (int i = 1;i <= tot;i++){
		if (cc[p] == s[i]){
			++p;
			if (p >= 5){
				if (s[i + 1] == 's') ans += 2,++i;
				else ++ans;
				p = 0;
			}
		}else if (cc[0] == s[i]) p = 1;
		else p = 0;
	}
	printf("%d\n",ans);
	fclose(stdin);
	fclose(stdout);
	return 0;
}