MOD = 998244353

max_fact = 10**5
fact = [1] * (max_fact + 1)
for i in range(1, max_fact + 1):
    fact[i] = fact[i-1] * i % MOD

n, k = map(int, input().split())
m = n - k
result = (k * fact[m]) % MOD
print(result)