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

ifstream fin("text.in");
ofstream fout("text.out");



int main() {
	
	int nrCuvinte = 0,nrLitere = 0; 
	char ch;
	bool anyLetter = 0;
	while(fin.get(ch))	{
		
		if (isalpha(ch)) {
			nrLitere++;
			anyLetter = 1;
		}
		else
		{
			if (anyLetter == 1)
			{
				anyLetter = 0;
				nrCuvinte++;
			}
		}
		

        

	}

	fout << nrLitere / nrCuvinte;

	return 0;
}