#include <stdio.h>

char ch;
int i;
FILE *f=(fopen("text.in","r"));
FILE *g=(fopen("text.out","w"));
enum sep {sp=' ',vg=',',pct='.',pctv=';',lin='-'};

int ver_sep(char ch){
  int ok;
  char i;

  ok=0;
  for (i=sp;i<=lin;i++)
  if (ch==i)
  {
   ok=1;
   break;
  }
return(ok);
}
int main(void){
  int ok;
  int nr_car;
  int cuv;
  int deja;

  ok=0;
  nr_car=0;
  cuv=0;
  deja=0;
  while ((ch=fgetc(f))!=EOF)
  {
    if (ver_sep(ch)==1)
    {
     if (ok==1)
     if (deja==0)
     {
      cuv++;
      deja=1;
     }
    }
    else
    {
     ok=1;
     deja=0;
     nr_car++;
    }

  }

fprintf(g,"%d",nr_car/cuv);
return(0);
}