//text
#include <stdio.h>
int main ()
{long s=0, sc=0;
char c;
FILE *fi, *fo;
fi=fopen("text.in","r");
fo=fopen("text.out","w");
while (!feof(fi))
      {

      fscanf(fi,"%c",&c);
      while (c!=' '&&c!='!'&&c!=','&&c!='?')
	    {
	    s++;
	    fscanf(fi,"%c",&c);
	    }
      sc++;
      }
fprintf(fo,"%ld",s/sc);
fclose(fi);
fclose(fo);
return 0;
}