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

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

    string H,S; cin >> H >> S;
    int h = H.at(H.size()-1)-'0',s = S.at(S.size()-1)-'0';
    if((h+s)%2 == 0) cout << "Possible" << endl;
    else cout << "Impossible" << endl;
}