gnuplot, 59 bytes

Result

AC

Duration

853ms

Code [DL]

se pr"-"
do for[i=2:256:8]{pr(v=ARG1[i:i+3])%11?v[3:]:v%10}

stdin

214 887
329 629
722 223
145 745
646 264
733 335
759 958
255 911
884 515
692 789
573 832
311 132
115 514
114 429
474 747
118 554
866 278
723 219
544 227
499 564
833 223
481 115
734 325
933 938
437 335
686 327
647 773
788 834
622 826
613 394
497 972
132 337

stdout

 8
 6
2
 7
 2
3
 9
5
 5
 7
 8
1
 5
 4
 7
 5
6
 2
4
9
3
 1
 3
3
 3
 3
 7
8
2
 3
 9
 3

stderr

strace

11    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffc109b6820 /* 7 vars */) = 0
12    execve("/bin/cat", ["cat", "-"], 0x55b22d237cf8 /* 7 vars */) = 0
12    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
13    execve("/usr/bin/gnuplot", ["/usr/bin/gnuplot", "-c", "/volume/CODE", "214 887\n329 629\n722 223\n145 745\n"...], 0x55b22d2cb290 /* 7 vars */) = 0
13    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
11    +++ exited with 0 +++