#include <fstream>
#include <string.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int nrcuv=0,nrlitere=0;
 char semne[]={' ',',','.','-','!','?','0','1','2','3','4','5','6','7','8','9'};
char text[1000];
int main()
{

    f.get(text,999);

     char *cuvant;
     cuvant=strtok(text,semne);
     while(cuvant!=NULL)
     {

         nrcuv++;
         nrlitere+=strlen(cuvant);
         cuvant=strtok(NULL,semne);


     }
     if(nrcuv==0||nrlitere==0)
      g<<"0";
     else
     g<<nrlitere/nrcuv;

    return 0;

}