#include <fstream>

using namespace std;

char c, ca;
int i, lit, cuv;
int main() {
	ifstream fin("text.in");
	ofstream fout("text.out");
	ca = '*';
	// citire caracter cu caracter
	for (;;) {
		c = fin.get();
		if ((c>='a' && c<='z') || (c>='A' && c<='Z')) {
			lit++;
			if (!(((ca>='a' && ca<='z') || (ca>='A' && ca<='Z'))))
				cuv++;
		}
		if (c == EOF)
			break;
		//fout<<c;
		ca = c;
	}
	fin.close();
	fout<<lit/cuv<<"\n";
	fout.close();
}