#include <bits/stdc++.h>
using namespace std;

#ifdef local
#include "debugger.hpp"
#else
#define debug(...)
#endif

int main(void) {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    constexpr char endl = '\n';

    string h, s;
    cin >> h >> s;

    int num1 = h.back() - '0', num2 = s.back() - '0';
    
    string ans = "Possible";
    if (num1 % 2 != num2 % 2) ans = "Impossible";

    cout << ans << endl;

    return 0;
}