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

int main () {

FILE *in;
in = fopen ("text.in", "r"); 

char c, last;
int letters = 0, words = 0;
while ((c = fgetc(in)) != EOF)
{
	
	if (isalpha (c) && !isalpha(last)) words++;
	last = c;
	if (isalpha (c)) letters++;
}
ofstream out ("text.out");
out << letters/words;
return 0;
}