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

int main ()
{
	ifstream f ("text.in");
	ofstream g ("text.out");
	
	char s[999999999] , sep[] = " 1234567890-?!;:.," , *p;
	int lit = 0 , nrcuv = 0 , med;
	
	f.get (s , 999999999);
	
	p = strtok (s , sep);
	
	while (p)
	{
		for (unsigned i = 0 ; i < strlen(p) ; ++i)
			lit++;
		
		nrcuv++;
		
		p = strtok (NULL , sep);
	}
	
	med = lit/nrcuv;
	
	g << med;
	
	return 0;
}