Programmers 정수 내림차순으로 배치하기

def solution(n):
    answer = sorted(list(map(int, list(str(n)))), reverse = True)
    answer = ''.join([str(x) for x in answer])
    return int(answer)

def solution(n):
    ls = list(str(n))
    ls.sort(reverse = True)
    return int("".join(ls))