문제: 금지된 단어를 제외한 가장 흔하게 등장하는 단어를 출력하라. 대소문자 구분을 하지 않으며, 구두점(마침표, 쉼표) 또한 무시한다. 예제: Input: paragraph = "Bob hit a ball, the hit BALL flew far after it was hit.", banned = ["hit"] Output: "ball" Explanation: "hit" occurs 3 times, but it is a banned word. "ball" occurs twice (and no other word does), so it is the most frequent non-banned word in the paragraph. Note that words in the paragraph are not..