#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main(void)
{
	int l, i,
		litere(0), cuvinte(0);

	ifstream g("text.in");
	ofstream f("text.out");

	string line;
	getline(g, line);

	for(i = 0, l = line.length(); i < l; i++)
	{
		if((line[i] >= 'a' && line[i] <= 'z') || (line[i] >= 'A' && line[i] <= 'Z'))
			++litere;
		else if(line[i] == ' ' || line[i+1] == NULL)
			++cuvinte;
	}

	f << (cuvinte / litere);

	g.close(); 
	f.close();
	return 0;
}