#include<stdio.h>
#include<stdlib.h>

int main(void)
{
    FILE * fin=fopen("text.in","r");
    FILE * fout=fopen("text.out","w");
    int sum=0;
    int nrw=0;
    char c=0;
    int w=0;
    while(c!=33)
    {
                 fscanf(fin,"%c",&c);
                 printf("%d\n",c);
                // if(c==' ' || c=='-' || c=='!')
                        // if(w==1){ nrw++; w=0;}
                        // else {}
               //  else
                  if(isalnum(c))
                         {sum++;w=1;}
                  else
                      if(w==1) {w=0;nrw++;}
    }
    fprintf(fout,"%d",sum/nrw);
}