sorting a list using unicodes acending order, no loops, no sort(), using recursion

[lrn2codee]

try

in_text = "kd465b21"
in_list = [x for x in in_text]
    
in_list.sort(key=str.lower)

print("".join(in_list))

Output:
12456bdk

you did not read sir, im trying not to use sort() function,or any loops, im suppoused to use recursion only.
thank you for the effort but it does not help.