using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static double[] NList => ReadLine().Split().Select(double.Parse).ToArray();
    static double[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = ReadLine().Split();
        var h = c[0].Last() - '0';
        var s = c[1].Last() - '0';
        WriteLine(h % 2 == s % 2 ? "Possible" : "Impossible");
    }
}