import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String[] sa = br.readLine().split(" ");
		String h = sa[0];
		String s = sa[1];
		br.close();

		int hi = h.charAt(h.length() - 1) - '0';
		int si = s.charAt(s.length() - 1) - '0';
		int d = hi + si;
		if (d % 2 == 0) {
			System.out.println("Possible");
		} else {
			System.out.println("Impossible");
		}
	}
}