题解 | #字符串合并处理#

import re

strinput = input().split()

str1 = strinput[0]
str2 = strinput[1]
string = str1 + str2

strodd = []
streven = []
stringList = []
result = []
for i in range(len(string)):
    if i % 2 == 0:
        streven.append(string[i])
    else:
        strodd.append(string[i])
streven.sort()
strodd.sort()

for s in range((len(string) // 2) + 1):
    if s <= len(streven) - 1:
        stringList.append(streven[s])
    if s <= len(strodd) - 1:
        stringList.append(strodd[s])

for n in stringList:
    if n in re.findall("[0-9A-Fa-f]", n):
        n = int(n, 16)  # 十六转十进制
        b = format(n, "b").rjust(4, "0")[::-1]  # 十转二进制,并反转也可以用 ''.join(reversed(b))
        # print(b)
        x = int(b, 2)
        x = format(x, "x").upper()
        result.append(x)
    else:
        result.append(n)
print("".join(result))