#include <iostream>

const std::string Possible{"Possible"};
const std::string Impossible{"Impossible"};

void print_point(int x, int y) {
    std::cout << x << ' ' << y << '\n';
}

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

    int p, q;
    std::cin >> p >> q;

    if (2 * p <= q) {
        std::cout << Impossible << '\n';
        return 0;
    }

    std::cout << Possible << '\n';
    std::cout << 2 * q + 4 << '\n';
    print_point(0, 0);
    print_point(0, -1);
    for (int x = 1; x <= 2 * p - 1; ++x) {
        print_point(x, -1);
    }
    print_point(2 * p - 1, 0);
    print_point(2 * p - 1, 1);
    for (int x = 2 * p; x <= 2 * q; ++x) {
        print_point(x, 1);
    }
    print_point(2 * q, 0);
}