#include <bits/stdc++.h>
using namespace std;

bool is_letter(char c) {
	return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z');
}

int main() {
	FILE *in = fopen("text.in", "r"),
		 *out = fopen("text.out", "w");

	const int BUFSIZE = 6e4;
	char buf[BUFSIZE];
	int words = 0, letters = 0, last = 0;
	
	while (fgets(buf, BUFSIZE, in)) {
		for (int i = 0, l = strlen(buf); i < l; ++i) {
			if (is_letter(buf[i])) {
				++letters;
				words += !last;
			}
			last = is_letter(buf[i]);
		}
	}

	fprintf(out, "%d\n", letters / words);
}