### shortestCompletingWord 
from typing import *
def f_gold(licensePlate: str, words: List[str]) -> str:
    def count(word):
        counter = [0] * 26
        for c in word:
            counter[ord(c) - ord('a')] += 1
        return counter
    def check(counter1, counter2):
        for i in range(26):
            if counter1[i] > counter2[i]:
                return False
        return True
    counter = count(c.lower() for c in licensePlate if c.isalpha())
    ans, n = None, 16
    for word in words:
        if n <= len(word):
            continue
        t = count(word)
        if check(counter, t):
            n = len(word)
            ans = word
    return ans