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

using namespace std;

int main()
{
    ifstream e("text.in");
    ofstream g("text.out");
    char x[101];
    int nr = 0;
    e.get(x,101);
    int c = 0;
    char *p;
    p = strtok(x, " ,.?!:;-");
    while (p)
    {
        c = c + strlen(p);
        nr++;
        p = strtok(NULL, " ,.?!;:-");
    }
    g << c / nr;
    e.close();
    g.close();
    return 0;
}