[Level 1] / [Python] 정수 내림차순으로 배치하기

https://school.programmers.co.kr/learn/courses/30/lessons/12933

프로그래머스

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def solution(n):
    answer = []

    s = str(n)

    for i in s:
        answer.append(i) 
    
    answer = sorted(answer, reverse=True)

    answer = ''.join(answer)

    return int(answer)