#include <stdio.h>
#include <fstream>
std::ifstream in("text.in");
std::ofstream out("text.out");
int Caracter(char b)
{
	int i;
	i=b;
	if((i>='a'&&i<='z')||(i>='A'&&i<='Z'))
		return 1;
	return 0;
}
int main ()
{
	char a;
	long long lgt=0,cuv=0;
	while(in.get(a))
	{
		if(Caracter(a))
			lgt++;
		else
			if(a=='\n'||a==' '||a=='-')
				cuv++;
	}
	out<<lgt/cuv;
	out.close();
}