# include <fstream>
# include <string.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
    char txt[101], semn[]=" ,.?'-!_", *p;
    int nr_cuv=0, nr_lit=0;
    f.get(txt, 101); f.get();
    p=strtok(txt, semn);
    while (p!=NULL)
    {
        nr_cuv++;
        nr_lit+=strlen(p);
        p=strtok(NULL, semn);
    }
    g<<nr_lit/nr_cuv;
    f.close();
    g.close();
    return 0;
}