using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[] NMi => ReadLine().Split().Select(c => int.Parse(c) - 1).ToArray();
    static int[][] NMap(int n) => Enumerable.Repeat(0, n).Select(_ => NMi).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (n, k) = (c[0], c[1]);
        var mod = 998_244_353;
        WriteLine((long)k * (k - 1) % mod * n % mod * Exp(Exp(k, n, mod), mod - 2, mod) % mod);
    }
    static long Exp(long n, long k, int mod)
    {
        if (k == 0) return 1;
        if (k == 1) return n % mod;
        var half = Exp(n, k / 2, mod);
        var result = (half * half) % mod;
        return ((k % 2) == 0) ? result : ((result * n) % mod);
    }
}