#include <iostream>
#include <string>
#include <cctype>
using namespace std;

int main(){
	freopen("text.in", "r", stdin);
	freopen("text.out", "w", stdout);
	int letters = 0, words = 0, k = 0;
	char c;
	while((c = getchar())!= EOF){
		if(isalpha(c)){
			if(k == 0){
				k = 1;
				words++;
			}
			letters++;
		}else{
			k = 0;
		}
	}
	if(words == 0)
		printf("0\n");
	else
		printf("%d\n", letters/words);
	return 0;
}