문제 링크

정답 :

def solution(myString):
    answer = []

    for i in myString.split('x'):
        if not i == '':
            answer.append(i)

    return sorted(answer)

방법 1.

def solution(myString):
    answer = ' '.join(myString.split('x')).split()
    return sorted(answer)

방법 2.

def solution(myString):
    return sorted(ch for ch in myString.split('x') if ch)