#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef unsigned long long int ull;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) { return (ull)rng() % B; }

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