MOD = 998244353

def main():
    import sys
    input = sys.stdin.read
    data = input().split()
    N = int(data[0])
    K = int(data[1])
    
    m = N - K
    if m < 0:
        print(0)
        return
    
    # Precompute factorial up to m
    fact = [1] * (m + 1)
    for i in range(1, m + 1):
        fact[i] = fact[i-1] * i % MOD
    
    res = K * fact[m] % MOD
    print(res)

if __name__ == "__main__":
    main()