#include<cstdio>
#include<cstring>
using namespace std;
int main(){
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	int nrc=0,nrl=0;
	char t[260];
	fgets(t,256,stdin);
	int l=strlen(t)-1;
	for(int i=1;i<=l;++i){
		if(t[i]>='a' && t[i]<='z' || t[i]>='A' && t[i]<='Z')++nrl;
		if(t[i]==' ' || t[i]=='-')++nrc;
	}
	
	printf("%d",nrl/nrc);
	
	return 0;
	
}