#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <exception>
#include <functional>
#include <iomanip>
#include <ios>
#include <iostream>
#include <map>
#include <memory>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>

using namespace std;

using ld = long double;
using ll = long long;
using ull = unsigned long long;

template<class T> using pq = priority_queue<T>;
template<class T> using pqg = priority_queue<T, vector<T>, greater<T>>;

template<class T, class U> inline bool chmin(T& a, const U& b) { if (a > b) { a = b; return 1; } return 0; }
template<class T, class U> inline bool chmax(T& a, const U& b) { if (a < b) { a = b; return 1; } return 0; }

#define all(v) begin(v), end(v)

int main(void) {
  string s, t;
  cin >> s >> t;

  char c1 = s.back() - '0';
  char c2 = t.back() - '0';

  if (c1 % 2 == c2 % 2) cout << "Possible" << endl;
  else cout << "Impossible" << endl;

  return 0;
}