MOD = 998244353

def main():
    import sys
    input = sys.stdin.read
    N, K = map(int, input().split())
    
    max_fact = N - K
    fact = [1] * (max_fact + 1)
    for i in range(1, max_fact + 1):
        fact[i] = fact[i-1] * i % MOD
    
    ans = K * fact[max_fact] % MOD
    print(ans)

if __name__ == "__main__":
    main()