#include<stdio.h>
int main()
{
	freopen ("text.in", "r", stdin);
	freopen ("text.out", "w", stdout);

	char c;
	int l=0, k=0, r, z=0;

	while(scanf("%c", &c)!=EOF){
		if('a'<=c && c<='z' || 'A'<=c && c<='Z'){
			l++;
			z=1;
		}
		if(z==1){
			if(c==' ' || c=='-' || c=='!' || c=='?' || c=='.' || c==',' ||c==':' || c==';'){
				k++;
				z=0;
			}
		}
	}

	r=l/k;

	printf("%d", r);

  return 0;
}