题解 | 字符串加解密

#就是最原始的方法
def add_ser(n):
    sig_n = []
    for s in n:
        if s.isdigit() and int(s) != 9:
            sig_n.append(str(int(s)+1))
        elif s.isdigit() and int(s) == 9:
            sig_n.append('0')
        elif s.islower() and s != 'z':
            sig_n.append(chr(ord(s.upper())+1))
        elif s.islower() and s == 'z':
            sig_n.append('A')
        elif s.isupper() and s != 'Z':
            sig_n.append(chr(ord(s.lower())+1))
        elif s.isupper() and s == 'Z':
            sig_n.append('a')
        else:
            sig_n.append(s)
    return ''.join(sig_n)

# 解密
def solve_ser(m):
    sig_n = []
    for s in m:
        if s.isdigit() and int(s) != 0:
            sig_n.append(str(int(s) - 1))
        elif s.isdigit() and int(s) == 0:
            sig_n.append('9')
        elif s.islower() and s != 'a':
            sig_n.append(chr(ord(s.upper()) - 1))
        elif s.islower() and s == 'a':
            sig_n.append('Z')
        elif s.isupper() and s != 'A':
            sig_n.append(chr(ord(s.lower()) - 1))
        elif s.isupper() and s == 'A':
            sig_n.append('z')
        else:
            sig_n.append(s)
    return ''.join(sig_n)


n = input().strip()
m = input().strip()
print(add_ser(n))
print(solve_ser(m))