#include<stdio.h>
#include<ctype.h>
int main()
{
FILE*f=fopen("text.in","r");
FILE*g=fopen("text.out","w");
char c,c1;
long nrl,nrc;
fscanf(f,"%c",&c);
if(isalpha(c))
  nrl++;
else
  nrl=0;

nrc=1;
while(!feof(f))
  {fscanf(f,"%c",&c1);;
  if(isalpha(c1))
	 nrl++;
   if(c==' '&&isalpha(c1)||c=='-'&&isalpha(c1))
	 nrc++;
  c=c1;
  }
fprintf(g,"%ld",nrl/nrc);
fclose(f);
fclose(g);

return 0;
}