#include <fstream>
#include <fstream>

using namespace std;

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

long long nrl, nrc;
char c, c1;

int main()
{
	while (f.get(c))
	{
		if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) nrl++;
		else if ((c1 >= 'a' && c1 <= 'z') || (c1 >= 'A' && c1 <= 'Z')) nrc++;
		c1 = c;
	}
	g << nrl / nrc << '\n';
	return 0;
}