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

inline int EsteLitera(char c)
{
	if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'))
		return 1;
	else
		return 0;
}

int main()
{
	
	char p,c;
	int nr_cuvinte = 0, lungime = 0;
	ifstream fin("text.in");
	ofstream fout("text.out");
	fin >>noskipws>> p;
	if (EsteLitera(p) == 1)
	{
		nr_cuvinte++;
		lungime++;
	}
	while ( fin>>noskipws>>c)
	{
		if (EsteLitera(p) == 1 && EsteLitera(c) == 0)
			nr_cuvinte++;
		if (EsteLitera(c) == 1)
			lungime++;
		p = c;
		
		
	}
	fout << lungime / (nr_cuvinte + 1);
	fin.close();
	fout.close();
}