MOD = 998244353
MAX = 10**5 + 10

# Precompute factorials modulo MOD
fact = [1] * (MAX)
for i in range(1, MAX):
    fact[i] = fact[i-1] * i % MOD

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