def solution(phone_book):
phone_book.sort()
for num1, num2 in zip(phone_book, phone_book[1:]):
if num2.startswith(num1):
return False
return True
def solution(phone_book):
phone_book.sort()
for num1, num2 in zip(phone_book, phone_book[1:]):
if num2.startswith(num1):
return False
return True