using System.Numerics;
using System;

public class hello
{
    public static int MOD = 998244353;
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var n = long.Parse(line[0]);
        var k = long.Parse(line[1]);
        getAns(n,k);
    }
    static void getAns(long n, long k)
    {
        var ans = n;
        ans *= (k - 1);
        ans %= MOD;
        var inv = ModInv((int)k, MOD);
        var inv2 = BigInteger.ModPow(inv, n - 1, MOD);
        ans *=(long) inv2;
        ans %= MOD;
        Console.WriteLine(ans);
    }
    static int ModInv(int a, int m) => (int)BigInteger.ModPow(a, m - 2, m);
}