#include <fstream>
using namespace std;

int main(){
	int nrc=0, nrl=0; // nr de cuvinte, de litere
	char c;
	int incuvant=0;
	ifstream fin("text.in");
	while((c=fin.get())!=EOF){
		if( (c>='A' && c<='Z') || (c>='a' && c<='z') ){
			nrl++;
			if(!incuvant)
				nrc++;
			incuvant=1;
		}
		else
			incuvant=0;
	}
	ofstream fout("text.out");
	fout<<nrl/nrc<<endl;
	return 0;
}