#include <iostream>

#define MOD   998244353

using namespace std;

constexpr unsigned int pow_mod(const unsigned long long a, const unsigned long long b, const unsigned int mod)
{
	return (b == 0 ? (mod == 1 ? 0 : 1) : (b & 1 ? a % mod : 1) * pow_mod((a % mod) * (a % mod) % mod, b >> 1, mod) % mod);
}

int main()
{
	cin.tie(nullptr);
	ios::sync_with_stdio(false);

	int N, K;
	cin >> N >> K;

	cout << static_cast<long long>(N) * K % MOD * (K - 1) % MOD * pow_mod(pow_mod(K, MOD - 2, MOD), N, MOD) % MOD << '\n';
	return 0;
}