MOD = 998244353

def main():
    import sys
    input = sys.stdin.read().split()
    N = int(input[0])
    K = int(input[1])
    m = N - K
    # Precompute factorial up to m, but since m can be up to 1e5, precompute up front
    max_fact = 10**5
    fact = [1] * (max_fact + 1)
    for i in range(1, max_fact + 1):
        fact[i] = fact[i-1] * i % MOD
    if m < 0:
        print(0)
    else:
        res = (K % MOD) * fact[m] % MOD
        print(res)

if __name__ == "__main__":
    main()