vim, 53 bytes

Result

WA

Code [DL]

let a:i=sort(getline(1,'$'))
enew
p=s:i
1 delete _

Disassembly

let a:i=sort(getline(1,'$'))<CR><NL>enew<CR><NL>p=s:i<CR><NL>1 delete _

stdin

5651051052241510874996812424246498428666777860048409443557707037307968165853850984311819995130290569

stdout

5651051052241510874996812424246498428666777860048409443557707037307968165853850984311819995130290569

stderr

strace