vim, 47 bytes

Result

WA

Code [DL]

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

Disassembly

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

stdin

1783543982542902552098615056298684958136637379297387176934431381369653271396516878546803890208184752

stdout

1783543982542902552098615056298684958136637379297387176934431381369653271396516878546803890208184752

stderr

strace