powershell, 28 bytes

Result

INVALID

Duration

1642ms

Code [DL]

awk -vFS="" '$0=$2~$3?$2:$5'

stdin

997 792
617 179
724 518
533 312
832 421
166 628
272 476
445 588
665 692
542 474
978 774
396 753
297 996
297 472
422 559
399 882
134 226
798 564
366 767
377 671
939 395
517 779
924 338
677 772
794 697
977 587
811 118
912 416
623 322
829 998
752 282
277 153

stdout

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

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7fff4e747040 /* 6 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x55d971acac10 /* 6 vars */ <unfinished ...>
12    execve("/usr/bin/pwsh", ["/usr/bin/pwsh", "/volume/CODE"], 0x55d971acac28 /* 6 vars */ <unfinished ...>
11    <... execve resumed> )            = 0
12    <... execve resumed> )            = 0
11    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=11, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
15    +++ exited with 0 +++
16    +++ exited with 0 +++
12    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=15, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
33    execve("/usr/bin/awk", ["/usr/bin/awk", "-vFS=", "$0=$2~$3?$2:$5"], 0x7f99e0007210 /* 7 vars */) = 0
33    +++ exited with 0 +++
31    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=33, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
31    +++ exited with 0 +++
32    +++ exited with 0 +++
30    +++ exited with 0 +++
29    +++ exited with 0 +++
28    +++ exited with 0 +++
26    +++ exited with 0 +++
27    +++ exited with 0 +++
25    +++ exited with 0 +++
24    +++ exited with 0 +++
23    +++ exited with 0 +++
22    +++ exited with 0 +++
21    +++ exited with 0 +++
20    +++ exited with 0 +++
19    +++ exited with 0 +++
18    +++ exited with 0 +++
17    +++ exited with 0 +++
14    +++ exited with 0 +++
13    +++ exited with 0 +++
12    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=0, si_utime=36, si_stime=19} ---
10    +++ exited with 0 +++