#include <bits/stdc++.h>
using namespace std;

const int P = 998244353;

int qpow(int b, int k) {
    int ret = 1;
    while(k > 0) {
        if(k & 1) ret = ret * (long long)b % P;
        b = (long long)b * b % P;
        k >>= 1;
    }
    return ret;
}

int main() {
    int n, k;
    cin >> n >> k;
    cout << n * k * (k - 1ll) % P * qpow(qpow(k, n), P - 2) % P;
}