#include<fstream>


using namespace std;

int l, n;
char c1, c2;
ifstream in("text.in");

int main()
{
	c1=' ';
	while(!in.eof())
	{
		in.get(c2);
		if(c2>='a' && c2<='z' || c2>='A' && c2<='Z')
		{
			l++;
			if(!(c1>='a' && c1<='z' || c1>='A' && c1<='Z'))
				n++;
		}
		c1=c2;
		
	}
	ofstream out("text.out");
	out<<l/n;
	out.close();
	return 0;
}