题解 | #字符串合并处理#

while True:
    try:
        str = ''.join(input().split())
    except:
        break
    else:
        # 第二步奇偶排列
        oushu = [str[x] for x in range(0,len(str),2)]
        jishu = [str[x] for x in range(1,len(str),2)]
        oushu.sort()
        jishu.sort()
        paixu = []
        for i in range(len(str)):
            n = int(i/2)
            if i % 2 == 0:
                paixu.append(oushu[n])
            else:
                paixu.append(jishu[n])
        #第三步转换字符
        for i in paixu:
            try:
                b=bin(int(i,16))[2:]
                b = '0'*(4-len(b)) + b if len(b)<4 else b
                b = b[::-1]
                b = hex(int(b, 2))[2:].upper()
                print(b,end='')
            except:
                print(i,end='')
        print()