# 전화번호 목록
def solution(phone_book):
phone_book.sort()
for i, j in zip(phone_book, phone_book[1:]):
if i == j[:len(i)]:
return False
return True
def solution(phone_book):
phone_book.sort()
for i, j in zip(phone_book, phone_book[1:]):
if i == j[:len(i)]:
return False
return True