[Level 1] / [Python] 문자열 다루기 기본

https://school.programmers.co.kr/learn/courses/30/lessons/12918

프로그래머스

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def solution(s):
    answer = True
    
    for i in s:
        if i.isalpha() == True:
            return False
    
    if len(s) == 4 or len(s) == 6:
        answer = True
    else:
        answer = False
    
    return answer