MOD = 998244353

n, k = map(int, input().split())
m = n - k

# Precompute factorial of m modulo MOD
fact = [1] * (m + 1)
for i in range(1, m + 1):
    fact[i] = fact[i-1] * i % MOD

ans = k * fact[m] % MOD
print(ans)