#include <fstream>
using namespace std;
fstream f("text.in",ios::in),g("text.out",ios::out);


using namespace std;

char cuv;
bool cuvant=false;

long cv;
long cte;

int main()
{
	while (!f.eof())
	{
		f.get(cuv);
		if((cuv>='a' && cuv<='z') || ( cuv>='A' && cuv<='Z'))
		{
			cv++;
			if(!cuvant)
				cte++;
			cuvant=true;
		}
		else
			cuvant=false;
	}
	g<<cv/cte;
	return 0;
}