#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int litera(char a)
{
	if ((a >= 'a'&&a <= 'z') || (a >= 'A'&&a <= 'Z'))
		return 1;
	return 0;
}
int main()
{
	int k = 0, s = 0;
	long long cnt=0;
	char a;
	while (f >> a)
	{

		if (litera(a)==1)
		{
			s++;
			if (k == 0)
				cnt++;
			k = 1;
		}
		else
			k = 0;
	}
	g << s / cnt;
}