#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
char sep[]="`~!@#$%^&*()_-+=[{1234567890]};:'|\<,>./?|\ """;
char text[6000000],*p;
ifstream in("text.in");
ofstream out("text.out");
int main()
{
    unsigned long long nr_cuv=0, lg=0;
    in.getline(text,6000000);
    p=strtok(text,sep);
    while(p!=NULL)
    {
        lg+=strlen(p);
        nr_cuv++;
        p=strtok(0,sep);
    }
    out<<lg/nr_cuv;
    return 0;
}