class Solution:
    def countCharacters(self, words: List[str], chars: str) -> int:
        answer = 0
        char_count = {}
        for c in chars:
            char_count[c] = char_count.get(c, 0) + 1

        for word in words:
            word_count = {}
            is_valid = True

            for ch in word:
                word_count[ch] = word_count.get(ch, 0) + 1

                if word_count[ch] > char_count.get(ch, 0):
                    is_valid = False
                    break

            if is_valid:
                answer += len(word)

        return answer