#include <bits/stdc++.h>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int X,Y; cin >> X >> Y;
    cout << 4 << endl;
    cout << X << " " << Y << " " << Y << " " << Y << endl;
    int t; cin >> t;
    if(t == X) cout << X << endl;
    else cout << (X^1) << endl;
}