#include<bits/stdc++.h>
using namespace std;
int main(){
	string a,b;cin>>a>>b;
	reverse(a.begin(),a.end());
	reverse(b.begin(),b.end());
	int c=a[0]-'0',d=b[0]-'0';
	vector<string> ans={"Possible","Impossible"};
	cout<<ans[(c+d)%1]<<endl;
}