#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
	int k = 0, cnt = 0, s = 0;
	char a;
	while (f >> a)
	{

		if ((a>='a'&&a<='z')||(a>='A'&&a<='Z'))
		{
			s++;
			if (k == 0)
				cnt++;
			k = 1;
		}
		else
			k = 0;
	}
	g << s / cnt;
}