#include<fstream>

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

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