octave, 20 bytes

Result

AC

Code [DL]

disp(sort(fgets(0)))

stdin

2204579163410482977913019913156202002495755322753315720294658206991926565687125514728413291772292901

stdout

0000000001111111111111222222222222222222333333344444445555555555556666666777777777788889999999999999

stderr

octave: X11 DISPLAY environment variable not set
octave: disabling GUI features

strace