#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef long double ld;
typedef pair<ld, ld> point;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
 
const int N = (int)(20) + 7;
const int M = (int)(1e3) + 7;
const ll MOD = (ll)(998244353);
const ll INF = (ll)(1e10) + 7;
const ld eps = (ld)(1e-12);
 
#define pb push_back
#define mp make_pair
#define x first
#define y second

void precalc() {
}

ll pw(ll a, ll b) {
    if (!b) {
        return 1LL;
    }
    ll x = pw(a, b / 2LL);
    x *= x;
    x %= MOD;
    if (b & (1LL)) {
        x *= a;
        x %= MOD;
    }
    return x;
}

void solve(int num_t) {
    ll n, k;
    cin >> n >> k;
    ll ans = pw(k, n);
    ans = pw(ans, MOD - 2);
    ans *= (((n * k) % MOD) * (k - 1LL)) % MOD;
    ans %= MOD;
    cout << ans << endl;
}

int main() {
    precalc();
	/*int ttt;
	cin >> ttt;
	for (int i = 0; i < ttt; ++i) {
	    solve(i);
	}//*/solve(0);
	return 0;
}