题解 | 字符串合并处理

a = input().split()
a =  list(a[0] + a[1])
a[::2] = sorted(a[::2])  
a[1::2] = sorted(a[1::2]) 
for i in a:
    if i.isdigit() or (i.isalpha() and i.upper()<'G'):
        print(hex(int( ''.join(reversed(bin(int(i.lower(),16) )[2:].rjust(4,"0"))) ,2))[2:].upper(),end='')
    else:
        print(i,end='')