프로그래머스 42576. 완주하지 못한 선수

https://school.programmers.co.kr/learn/courses/30/lessons/42576

프로그래머스

def solution(participant, completion):
    answer = '' 
    participant = sorted(participant)
    completion = sorted(completion)

    for i in range(len(completion)):
        if participant[i] != completion[i]:
            answer = participant[i]
            return answer
    answer = participant[-1]
    return answer