题解 | #字符串合并处理#

def change(x):
    res="0123456789abcdefABCDEF"
    if x in res:
        temp=bin(int(x,16))[2:].rjust(4,'0')[::-1]
        # 获得16进制数
        return hex(int(temp,2))[2:].upper()
    else: return x
strs=input().replace(' ','')
n=len(strs)
odd=""
even=""
for i in range(n):
    if i%2==0:
        even+=strs[i]
    else: odd+=strs[i]
odd="".join(sorted(odd))
even="".join(sorted(even))
# print(odd,even,end=" ")
ans=""
for i in range(len(odd)):
    ans+=even[i]+odd[i]  
# print(ans)
if len(even)>len(odd):
    ans+=even[-1]
ss=""                          
for i in range(len(ans)):
    ss+=change(ans[i])
# print(change('y'))
print(ss)