//#include <monsterenergy>
#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
typedef long long ll;
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
const int MAX = 1e9;
const int MIN = -1*1e9;
const ll MAXLL = 1e18;
const ll MINLL = -1*1e18;

int main()
{
    int N,K; cin >> N >> K;
    cout << (((mint(1)/K).pow(N))*(K*(K-1))*(N)).val() << endl;
    return 0;
}