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


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

}