#include<iostream>
#include<fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char c;
bool checklit(char s)
{
	return ('a'<=s && s<='z') || ('A'<=s && s<='Z');
}
int main()
{
	int nc=0,nl=0,nlc=0;
	while (f>>noskipws>>c)
	{
		if (checklit(c))
		{
			++nl;
			if (nlc==0)
			{
				++nc;
				++nlc;
			}
		}
		else
			nlc=0;
	}
	g<<nl/nc;
	return 0;
}