#include<stdio.h>
#include<string.h>
char a[10000];
int main()
{ FILE *f=fopen("text.in","r");
  fgets(a,10000,f);
  long s=0,c=0;
  char *p;
  p=strtok(a,"-,.;@#$%^&*():?! ");
  if(p)
    { s=s+strlen(p);
      c++;
    }
  while(p)
    { p=strtok(NULL,"-,.;@#$%^&*() :?!");
      if(p)
	{ s=s+strlen(p);
	  c++;
	}
    }
  FILE *g=fopen("text.out","w");
  fprintf(g,"%l",s/c);
  fclose(f);
  fclose(g);
  return 0;
}