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"); } }