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

ifstream f("text.in");
ofstream g("text.out");

short unsigned int s = 0, k = 0;
char a;
int ok = 0;

bool litera(char a)
{
	if ((a >= 'a' && a <= 'z') || (a >= 'A' && a <= 'Z')) 
		return 1;
	return 0;
}
int main()
{
	while (f.get(a))
	{
		if (litera(a) == 1)
		{
			s++;
			if (ok == 0)
			{
				k++;
				ok = 1;
			}
		}
		else ok = 0;
	}
	g << s / k;
}