def main():
    N = int(input())
    X = list(map(int, input().split()))
    Y = list(map(int, input().split()))
    length = -1
    for i in range(N):
        if X[i] == Y[i] == 0:
            length = 0
            break
        if X[i] == Y[i] == 1:
            length = 2
    if length == -1:
        length = min(X) + min(Y) + 1

    print(length)
    print(0)
    for i in range(N):
        if length == 0:
            print(0)
        else:
            print(min(X[i],Y[i]))
    print(0 + length)

if __name__ == "__main__":
    main()