vim, 13 bytes

Result

WA

Code [DL]

:s/(.)/\1\n/g

Disassembly

:s/(.)/\1\n/g

stdin

2098213232685335478824139850893955666467094625995061960342680074469026336194403900500470771467067233

stdout

2098213232685335478824139850893955666467094625995061960342680074469026336194403900500470771467067233

stderr

strace