#include <stdio.h>
#include <string.h>

int main() {
	freopen("text.in", "rt", stdin);
	freopen("text.out", "wt", stdout);
	int word_length, total_length, word_number;
	char c;
	word_number = 0;
	total_length = 0;
	word_length = 0;
	while (scanf("%c", &c) != EOF) {
		if (isalpha(c)) {
			word_length++;
			total_length++;
		} else if (word_length != 0) {
			word_number++;
			word_length = 0;
		}
	}
	
	printf("%d", total_length / word_number);
	return 0;
}