8.1.3-3

#include <iostream>
#include <iomanip>
#include <algorithm>
#include <cmath>

using namespace std;
int f(int n) {
    int d = 2;
    for (int i = 2; i < sqrt(n); i++) {
        if (n % i == 0) {
            d += 2;
        }
    }
    return d;
}

int main()
{
    int a, b, maxim;
    cin >> a >> b;
    cout << f(6) << endl;
    maxim = -10000000000000;
    for (int i = a; i <= b; i++) {
        if (f(i) > maxim) {
            maxim = f(i);
        }
    }
    for (int i = a; i <= b; i++) {
        if (f(i) == maxim) {
            cout << i << " ";
        }
    }
    return 0;
}