#include <fstream.h>
#include <iomanip.h>
ifstream fi("text.in");
ofstream fo("text.out");

long long n=0;//lungimea totala
long long c=0;//numarul de cuvinte
long off=0;


int main()
	 {char ch;
		while (!fi.eof())
				 {fi>>resetiosflags(ios::skipws)>>ch;
					if ((ch>='a' && ch<='z') || (ch>='A' && ch<'Z'))
						{if (off==0) c++;
						 n++;
						 off=1;}
					else off=0;}
		fi.close();
		fo<<n/c<<'\n';
		fo.close();
		return 0;}