#include <iostream>

using namespace std;

int main () {
    int X, Y; cin >> X >> Y;

    cout << 4 << "\n";
    cout << X << " " << Y << " " << Y << " " << Y << "\n";
    cout << flush;

    int t; cin >> t;
    int ans = X;
    if (t != X) ans = t;

    cout << ans << "\n";
    cout << flush;
}