#include<stdio.h>
long cuv,a,b,d,nr,s,j,k,l;
char c;
int main()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	a=0;
	cuv=1;
	scanf("%c",&c);
	k=0;
	while (c!='\n')
	{
	b=c;
	if ((b>=65&&b<=90)||(b>=97&&b<=122))
	{
		k++;
		if (cuv)
			{
				nr++;
				cuv=0;
			}
	}
	else
	cuv=1;
	scanf("%c",&c);
	}
	printf("%ld\n",k/nr);
	return 0;
}