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

int main(){
	string H, S;
	cin >> H >> S;
	int h, s;
	h = (int)H[H.length() - 1];
	s = (int)S[S.length() - 1];
	if(h % 2 == s % 2){
	  cout << "Possible" << endl;
	}else{
	  cout << "Impossible" << endl;
	}
  return 0;
}