字符串加密

def solve(key, s):
    seen = set()
    new_key = ''
    for c in key.lower():
        if c.isalpha() and c not in seen:
            new_key += c
            seen.add(c)
    for c in 'abcdefghijklmnopqrstuvwxyz':
        if c not in seen:
            new_key += c
    result = ''
    for c in s:
        if c.islower():
            result += new_key[ord(c) - ord('a')]
        elif c.isupper():
            result += new_key[ord(c) - ord('A')].upper()
        else:
            result += c
    print(result)