powershell, 28 bytes

Result

INVALID

Duration

1485ms

Code [DL]

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

stdin

513 949
366 637
711 852
447 449
622 442
938 838
449 914
836 869
883 182
552 229
473 728
967 445
782 558
399 694
633 317
876 765
399 895
441 414
597 476
292 491
462 265
539 739
773 778
461 677
633 339
251 115
277 223
853 378
166 826
944 449
871 485
193 442

stdout

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

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7fffa0d1bf10 /* 6 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x5582283a5c10 /* 6 vars */) = 0
12    execve("/usr/bin/pwsh", ["/usr/bin/pwsh", "/volume/CODE"], 0x5582283a5c28 /* 6 vars */) = 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"], 0x7f665c01cd90 /* 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 +++
27    +++ exited with 0 +++
26    +++ 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 +++