#include <bits/stdc++.h>
using namespace std;
const long long MOD = 998244353;
int main(){
  int N, K;
  cin >> N >> K;
  vector<long long> inv(K + 1);
  inv[1] = 1;
  for (int i = 2; i <= K; i++){
    inv[i] = MOD - inv[MOD % i] * (MOD / i) % MOD;
  }
  long long ans = (long long) K * (K - 1) % MOD * N % MOD;
  for (int i = 0; i < N; i++){
    ans *= inv[K];
    ans %= MOD;
  }
  cout << ans << endl;
}