# include <fstream>
# include <string.h>

using namespace std;

int main ()
{
    char t[1001],sep[]=" !#$%^&*()-=+',./\0123456789?@",*p;
    unsigned s=0,cuv=0;
    ifstream fin ("text.in");
    ofstream fout("text.out");
fin.get(t,1001);
    p=strtok(t,sep);

    while(p)
    {s+=strlen(p);
        cuv++;
        p=strtok(NULL,sep);
    }
   if(cuv!=0)
    fout<<s/cuv;
   else
    fout<<0;
   fin.close();
   fout.close();
    return 0;
}