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

int main(){
  string h,s;
  cin>>h>>s;
  ll hb=h.back()-'0';
  ll sb=s.back()-'0';
  if(hb%2==sb%2){
    cout<<"Possible"<<endl;
  }else{
    cout<<"Impossible"<<endl;
  }
}