from collections import defaultdict, deque
from sys import stdin

readline = stdin.readline


def li():
    return list(map(int, readline().split()))


mod = 998244353


def plus_mod(a, b):
    return (a + b) % mod


def minus_mod(a, b):
    return (a - b) % mod


def multiply_mod(a, b):
    return (a * b) % mod


def pow_mod(i, p):
    if p == 0:
        return 1
    a = pow_mod(i, p >> 1)
    a = (a * a) % mod
    if p & 1 == 1:
        a = (a * i) % mod
    return a


def inv_mod(i):
    return pow_mod(i, mod - 2)


# num / K**N
# num = K**N * ans
N, K = li()

# N*(K-1)*K = K**N * ans
n_inv = inv_mod(pow_mod(K, N))
ans = multiply_mod(N * (K - 1) * K % mod, n_inv)
print(ans)