#include <bits/stdc++.h>
using namespace std;
using ll = long long;
ll const m = 998244353;
ll mpow(ll a, ll n) {
	ll ret = 1;
	while (n) {
		if (n & 1) ret = (ret * a) % m;
		a = (a * a) % m;
		n >>= 1;
	}
	return ret;
}
int main () {
	int N, K;
	cin >> N >> K;
	ll ans = mpow(K, m - 2);
	ans = mpow(ans, N);
	ans = (ans * N) % m;
	ans = (ans * K) % m;
	ans = (ans * (K - 1)) % m;
	cout << ans << endl;
}