MOD = 998244353

# Precompute factorials modulo MOD up to 10^5
max_n = 10**5
fact = [1] * (max_n + 1)
for i in range(2, max_n + 1):
    fact[i] = fact[i-1] * i % MOD

# Read input
N, K = map(int, input().split())

m = N - K
result = K * fact[m] % MOD
print(result)