#include<stdio.h>

#define dim 101

int main()
{
	freopen ("text.in","r",stdin);
	freopen ("text.out","w",stdout);

	char c;


	long nrl=0,nrc=0,lcuv=0;

	while(scanf("%c",&c)!=EOF)

	{	if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))

			nrl++, lcuv++;

		else
		{
			if(lcuv)

				nrc++;

			lcuv = 0;
		}
	}

	printf("%ld ",nrl/nrc);

	return 0;

}