题解 | #合并k个已排序的链表#

link_list = input()
link_list = link_list.replace('[', '')
link_list = link_list.replace(']', '')
link_list = link_list.replace('{', '')
link_list = link_list.replace('}', '')
link_list = link_list.split(',')
if link_list[0] == '':
    print('{}')
else:
    nums = []
    for each in link_list:
        if each == '':
            continue
        nums.append(int(each))
    res = '{' + ','.join(map(str, sorted(nums))) + '}'
    print(res)