题解 | #字符串加解密#

def encode(s: str):
    letter = "abcdefghijklmnopqrstuvwxyza"
    digit = "01234567890"
    res = ""
    for i in s:
        if i.isdigit():
            res += digit[digit.find(i) + 1]
        elif i.isalpha():
            if i.isupper():
                res += letter[letter.find(i.lower()) + 1].lower()
            else:
                res += letter[letter.find(i) + 1].upper()
        else:
            res += i
    return res

def decode(s: str):
    letter = "azyxwvutsrqponmlkjihgfedcba"
    digit = "09876543210"
    res = ""
    for i in s:
        if i.isdigit():
            res += digit[digit.find(i) + 1]
        elif i.isalpha():
            if i.isupper():
                res += letter[letter.find(i.lower()) + 1].lower()
            elif i.islower():
                res += letter[letter.find(i) + 1].upper()
        else:
            res += i
    return res

print(encode(input().strip()))
print(decode(input().strip()))