#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
	string s,t;
	cin>>s>>t;
	int a = s[s.size()-1]-'0', b = t[t.size()-1]-'0';
	cout<<(a%2 == b%2 ? "Possible" : "Impossible")<<endl;
}