using namespace std;
#include<fstream>
long long letter,nrcuv,k;
int main()
{
	ifstream in("text.in");
	ofstream out("text.out");
	char chs;
	in.get(chs);
	while(!in.eof())
	{
		if(isalpha(chs))
		{
			letter++;
			k++;
		}
		else
			if(k)
			{
				k=0;
				nrcuv++;
			}
		in.get(chs);	
	}
	if(isalpha(chs))
		nrcuv++;
	out<<letter/nrcuv<<'\n';
	in.close();
	out.close();
	return 0;
}