#include<fstream>
using namespace std;
ifstream f ("text.in");
ofstream g ("text.out");
int kca, kcu;
char c;
int main()
{
	c=f.get();
	while (!(('a'<=c && c<='z') || ('A'<=c && c<='Z')))
		c=f.get();
	while (c!=-1)
	{
		while (('a'<=c && c<='z') || ('A'<=c && c<='Z'))
		{
			kca++;
			c=f.get();
		}
		if (!(('a'<=c && c<='z') || ('A'<=c && c<='Z')))
			kcu++;
		while ((!(('a'<=c && c<='z') || ('A'<=c && c<='Z'))) && c!=-1)
			c=f.get();
	}
	g<<kca/kcu;
	g.close();
	return 0;
}