# include <fstream>
# include <iostream>
using namespace std;
int main ()
{
	char c;
	ifstream fin ("text.in");
	ofstream fout ("text.out");
	int nrcuv=0, nrc=0, am=0;
	c=fin.get();
	while (c!=EOF)
	{
		if ((c>='a' && c<='z') || (c>='A' && c<='Z'))
			am=1, ++nrc;
		else
			if (am)++nrcuv, am=0;
		c=fin.get();
	}
	if (am)++nrcuv;
	fout<<nrc/nrcuv;
	return 0;
}