oh, 36 bytes

Result

INVALID

Duration

1062ms

Code [DL]

cat | sed 's/.*\(.\)\(\1\| \).*/\1/'

stdin

315 354
393 518
881 626
118 817
782 224
919 991
922 224
833 411
295 958
266 772
955 559
155 545
316 914
849 458
912 124
937 553
842 447
613 378
273 773
287 637
327 449
733 637
689 946
677 969
853 935
692 419
955 571
439 317
711 996
399 193
872 474
152 258

stdout

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

stderr

strace

11    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffdaf562e00 /* 7 vars */) = 0
12    execve("/bin/cat", ["cat", "-"], 0x5590660c3048 /* 7 vars */) = 0
14    execve("/usr/bin/go", ["/usr/bin/go", "env", "GOPATH"], 0x5590660c3078 /* 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} ---
16    +++ exited with 0 +++
17    +++ exited with 0 +++
18    +++ exited with 0 +++
15    +++ exited with 0 +++
14    +++ exited with 0 +++
13    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14, si_uid=0, si_status=0, si_utime=0, si_stime=1} ---
13    execve("/root/go/bin/oh", ["/root/go/bin/oh", "/volume/CODE"], 0x5590660c3068 /* 7 vars */) = 0
30    execve("/bin/cat", ["cat"], 0xc0002a8000 /* 8 vars */) = 0
30    +++ exited with 0 +++
27    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=30, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
31    execve("/bin/sed", ["sed", "s/.*\\(.\\)\\(\\1\\| \\).*/\\1/"], 0xc000266410 /* 8 vars */) = 0
31    +++ exited with 0 +++
13    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=31, si_uid=0, si_status=0, si_utime=0, si_stime=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 +++
13    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=0, si_utime=3, si_stime=6} ---
11    +++ exited with 0 +++