#include"bits/stdc++.h"
using namespace std;
using ll = long long;
using ld = long double;
#define rep(i,m,n) for(ll i=(ll)m;i<(ll)n;i++)
#define Endl endl
#define pr(i,j) make_pair(i,j) 
const ll mod = 1000000007;
const ll inf = 5e18;
const ld pi = 3.14159265358979;
int main() {
	string h, s;
	cin >> h >> s;
	ll a = h[h.length() - 1] - '0';
	ll b = s[s.length() - 1] - '0';
	if ((a + b) % 2 == 0)cout << "Possible" << endl;
	else cout << "Impossible" << endl;
}