#include <fstream>
#include <iostream>
using namespace std;

int litera(char c){ return c>='a' && c<='z' || c>='A' && c<='Z';}

int main(){
	ifstream fin("text.in");
	int nrcuv=0,nrlit=0, incuvant=0;
	char c;
	while( ( c=fin.get() ) ){
		if(fin.eof())
			break;
		if( litera(c) ){
			nrlit++;
			if(!incuvant)
				nrcuv++, incuvant=1;
		}
		else
			incuvant=0;
	}
	ofstream fout("text.out");
	fout<<nrlit/nrcuv<<endl;
	return 0;
}