A = list(map(int, input().split()))
B = list(map(int, input().split()))
i = 0
j = 0
S = []
while i < len(A) and j < len(B):
    if A[i] < B[j]:
        S.append(A[i])
        if i == len(A) - 1:
            S += B[j::]
        i += 1
    else:
        S.append(B[j])
        if j == len(B) - 1:
            S += A[i::]
        j += 1
print(*S)