// http://www.infoarena.ro/problema/text

#include<stdio.h>

int main()
{
	int OK,nrcuv=0,nrlit=0,sum;
	char c;

 FILE *f=fopen("text.in","r");
 FILE *g=fopen("text.out","w");

 OK=0;
 while (!feof(f))
 {
	 fscanf (f,"%c",&c);
	 if ((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
		 if (OK==0)
		 {
			 nrcuv++;
			 OK=1;
			 nrlit++;
		 }
		 else
		 {
			 nrlit++;
		 }
	 else
		 OK=0;
 }

 fprintf (g,"%d",nrlit/nrcuv);

 return 0;
}