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

int main()
{
	freopen("text.in", "r", stdin);
	freopen("text.out", "w", stdout);
	char c;
	int cWords, cTot;
	cWords = cTot = 0;
	c = getchar();
	while (c != EOF) {
		while (isalpha(c)) {
			++cTot;
			c = getchar();
		}
		while (!isalpha(c) && c != EOF) {
			c = getchar();
		}
		++cWords;
	}
	printf("%d\n", cTot/cWords);
	return 0;
}