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

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    string s, t;
    cin >> s >> t;
    cout << ((s.back() - '0') % 2 == (t.back() - '0') % 2 ? "Possible" : "Impossible") << '\n';
}