// Afla lungimea medie a cuvintelor din text

#include <fstream>
#include <cstdio>
#include <cstdlib>

using namespace std;

const int MAXSIZE = 1024;

int main() {
	ifstream fin("text.in");
	ofstream fout("text.out");
	char* alfabet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
	char* buffer = new char[MAXSIZE];
	int nr_w=0, nr_l=0;
	while (!fin.eof()) {
		fin >> buffer;
		for(int i=0; i<(int)strlen(buffer) ; i++) {
			if (strchr(alfabet,buffer[i])==NULL) {
				i++;
				while ((strchr(alfabet,buffer[i])==NULL)&&(i<=(int)strlen(buffer)))
					i++;
				if (i<(int)strlen(buffer)) {
					nr_w+=1;
					nr_l+=1;
				}
			}
			else {
				if (i==0) 
					nr_w++;
				nr_l+=1;
			}
		}
	}
	fout << nr_l/nr_w;
	fin.close();
	fout.close();
	return 0;
}