#include <stdio.h>

FILE *  in=fopen("text.in","r");
FILE * out =fopen("text.out","w");

char c;
int k=0,lungime=0, cuv=0;

int main()
{
 while(fscanf(in,"%c",&c)!=EOF)
 {if((c>=65 && c<=90)||(c>=97 && c<=122))
  {lungime+=1;
   if(k==0)
    cuv+=1;
   k=1;
  }
  else
   k=0;
 }
 if(cuv!=0)
  fprintf(out,"%d", lungime/cuv);
 return 1;
}