#include<stdio.h>
#include<string.h>
 
int main()
{
 int ok,nr,cuv;
 char c;
 FILE *f=fopen("text.in","r");
 FILE *g=fopen("text.out","w");
 
 fscanf(f,"%c",&c);
 while(!feof(f)&&(!((c>='a'&&c<='z')||(c>='A'&&c<='Z'))))
   fscanf(f,"%c",&c);
  
 nr=0;
 cuv=0;
 ok=0;
 while(!feof(f))
 {
  if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
  {
   nr++;
   ok=1;
  }
  else
  {
   if(ok==1)
    cuv++;
   ok=0;
  }
  fscanf(f,"%c",&c);
 }
  
 fprintf(g,"%d",nr/cuv);
}