#include <stdio.h>
#include <ctype.h>

#define IN "text.in"
#define OUT "text.out"

int main(void) {

	long len_text = 0, nr_cuv = 0, cuv = 0;
	char ch;

	freopen(IN, "r", stdin);
	freopen(OUT, "w", stdout);

	while((ch = getchar()) != EOF) {

		if(!ok && isalpha(ch)) ++nr_cuv, ok = 1, ++len_text;
		else if(ok && isalpha(ch)) ++len_text;
		else if(ok && !isalpha(ch)) ok = 0;
	}

	printf("%ld", len_text / nr_cuv);

	return 0;
}