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

int main()
{
	
	char p;
	int nr_cuvinte = 0, lungime = 0;
	ifstream fin("text.in");
	ofstream fout("text.out");

	while ( fin>>noskipws>>p)
	{
		

		if ((p >= 'A' && p <= 'Z') || (p >= 'a' && p <= 'z'))
			lungime++;
		if (p == ' ' || p==' \n' || p=='\n')
			nr_cuvinte++;
		
		
	}
	fout << lungime / (nr_cuvinte + 1);
	fin.close();
	fout.close();
}