#include <stdio.h>

FILE *in, *out;
int cuv, cuvant, lu, lung;
char c;
int main(void)
{
 in=fopen("text.in", "rt");
 out=fopen("text.out", "wt");
 lung=0; lu=0; cuv=0;
while(!feof(in)){
 c=fgetc(in);
 if(!((c>='a' && c<='z')||(c>='A' && c<='Z')))
 {
  if(cuvant==1) cuv++;
  cuvant=0;
  lung=lung+lu;
  lu=0;
 }
 else
 {
  cuvant=1;
 // if((c>='a' && c<='z')||(c>='A' && c<='A'))
  lu++;
 }
// if(cuvant==0) cuv++;
}
fprintf(out, "%d", lung/cuv);
return 0;
}