题解 | #字符串合并处理#

while True:
    try:

        s = list(input().replace(" ", ""))
        s[::2] = sorted(s[::2])
        s[1::2] = sorted(s[1::2])

        for i in s:
            if "0" <= i <= "9" or "a" <= i <= "f" or "A" <= i <= "F":
                n = hex(int(bin(int(i, 16))[2:].rjust(4, "0")[::-1], 2))[2:].upper()
            else:
                n = i
            
            print(n, end="")
    except:
        break