#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using ll = long long;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using mint = atcoder::modint998244353;

int main(){
	string h,s;
	cin>>h>>s;
	int hh=h.back()-'0',ss=s.back()-'0';
	if(hh%2==ss%2) cout<<"Possible\n";
	else cout<<"Impossible\n";
}