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

#define rep(i, n) for( ll i = 0; i < n; i++ )
using ll = long long;

int main() {
	string sh, ss;
	cin >> sh >> ss;
	ll h = 0, s = 0;
	ll sz = sh.size(), sg = 1;
	if(sh[0] == '-') sg = -1;
	h = sh[sz-1];
	h *= sg;
	sz = ss.size(), sg = 1;
	if(ss[0] == '-') sg = -1;
	s = ss[sz- 1];
	s *= sg;
	string ans = "Possible";
	if(abs(h + s) % 2) ans = "Impossible";
	cout << ans << endl;
}