def solution(phone_number):
    answer = ""
    answer = "*" * len(phone_number[:-4]) + phone_number[-4:]
    return answer

 

def solution(phone_number):
    return "*" * len(phone_number[:-4]) + phone_number[-4:]

def solution(n):
    answer = []
    answer_list = []
    
    answer_list = list(str(n))
    answer_list = answer_list[::-1] # 역순으로 바꿈
    
    for i in answer_list:
        answer.append(int(i))
    return answer

 

def solution(n):
    return [int(x) for x in str(n)[::-1]]

def solution(n, m):
    a, b = n, m
    while m != 0:
        result = m
        n, m = m, n % m
    answer = [result, int(a*b/result)]
    return answer

def solution(s):
    if len(s) == 4 or len(s) == 6:
        try:
            if int(s):
                return True
        except:
            return False
    else:
        return False

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