# coding=utf-8
first=True
while True:
    S=input()
    if S is None or S=='':
        break
    if first==True:
        first=False
    else:
        print()

    A=S.split(' ')
    A=A[1:]
    print(' '.join(A))
    S=input()
    B=S.split(' ')
    B=B[1:]
    print(' '.join(B))
    for i in B:
        if i in A:
            pass
        else:
            A.append(i)
        print(' '.join(A))


/**************************************************************
	Problem: 2135
	User: admin
	Language: Python
	Result: Accepted
	Time:101 ms
	Memory:34480 kb
****************************************************************/