#include <cstdio>
#include <cstring>
using namespace std;

int main ()  {
	
	freopen ("text.in", "r", stdin);
	freopen ("text.out", "w", stdout);
	
	char *s = new char, *p = new char;
	const char *v=",.;:?! -'";
	int nr_cuv=0, nr_lit=0;
	fgets(s, 1000000000, stdin);
	p=strtok(s, v);
	while (p) {
		nr_cuv++;
		nr_lit=nr_lit+strlen(p);
		p=strtok(NULL, v);
	}
	printf("%d", nr_lit/nr_cuv);
	return 0;
	
}