jq, 23 bytes

Result

WA

Duration

825ms

Code [DL]

.[index(.[2:3])*2:][:1]

stdin

639 379
499 342
393 993
653 883
613 432
326 628
155 534
468 265
877 778
847 473
588 881
913 794
813 359
419 323
566 762
589 791
551 578
292 335
785 583
778 272
799 892
536 365
782 459
322 254
977 348
491 991
247 623
426 688
778 885
122 331
343 337
488 334

stdout

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

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7fff1afe4880 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x56506f3fbcf8 /* 7 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} ---
13    execve("/usr/bin/jq", ["/usr/bin/jq", "-rR", "-f", "/volume/CODE"], 0x5650708c8430 /* 7 vars */ <unfinished ...>
12    +++ exited with 0 +++
10    --- 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 resumed>)             = 0
13    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=0, si_utime=2, si_stime=0} ---
10    +++ exited with 0 +++