#include <fstream>

using namespace std;

int main()
{
	ifstream in("text.in");
	ofstream out("text.out");
	
	int cnt = 0;
			
	int nr = 0, start = false;
	
	while(in.peek() != EOF)
	{
		char c = in.get();
		if(((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
		{
			++cnt;
			if(start == false)
			{
				++nr;
				start = true;
			}
		}
		else
		{
			start = false;
		}
	}
		
	if(nr == 0)
		out << 0;
	else	
		out << cnt / nr;
	
	
	return 0;
}