#include<stdio.h>
#include<ctype.h>
 FILE *f=fopen("text.in","r");
 FILE *g=fopen("text.out","w");

int main()
{
 long k=0,contor=0,contor2=0;
 char c;
 while(!feof(f))
 {
  fscanf(f,"%c",&c);
	if(isalpha(c))
	{
	 contor++;
	 if(k==0)
	 {
	  contor2++;
	  k=-1;
	 }
	}
  else
	k=0;
 }
 fprintf(g,"%ld",(contor/contor2));
 fcloseall();
 return 0;
}