题解 | #字符串合并处理#

str1, str2 = input().split()
# 0.合并
s = str1 + str2
# 1.分离出奇偶序号字母
s_even = []
s_odd = []
for i in range(len(s)):
    if i % 2 == 0:
        s_even.append(s[i])
    else:
        s_odd.append(s[i])
# 2.排序
s_even.sort()
s_odd.sort()
# 3.构造新字符串
ns = ""
for i in range(len(s) // 2):
        ns += s_even[i] + s_odd[i]
if len(s)%2 != 0:# 长度为奇数则再添加s_even最后一个元素
    ns += s_even[-1]
# 4.进制转换
res = ""
for i in ns:
    if 48 <= ord(i) <= 57 or 65 <= ord(i) <= 70 or 97 <= ord(i) <= 102:
        res += hex(int(bin(int(i, 16))[2:].rjust(4,'0')[::-1], 2))[2:].upper()
    else:
        res += i
print(res)