""""
有序链表合并,条件判断
"""
if __name__ == "__main__":
a = list(map(int, input().strip().split()))
b = list(map(int, input().strip().split()))
ans = []
i = j = 0
while i < len(a) and j < len(b):
if a[i] < b[j]:
ans.append(a[i])
i += 1
else:
ans.append(b[j])
j += 1
ans += a[i:]
ans += b[j:]
print(' '.join(map(str, ans)))