python3, 40 bytes

Result

WA

Duration

805ms

Code [DL]

for s in open(0):print(s[len(s[1:2])*2])

stdin

366 261
675 775
369 166
451 765
199 339
271 995
967 971
422 293
566 668
163 633
541 145
731 384
744 143
962 252
874 446
344 134
724 429
898 982
166 617
378 345
452 116
644 113
851 919
834 481
224 448
488 676
955 899
292 695
277 776
653 523
429 164
279 774

stdout

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

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7fff75ca85f0 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x560bd15abd38 /* 7 vars */) = 0
12    execve("/usr/bin/python3", ["/usr/bin/python3", "/volume/CODE"], 0x560bd15abd50 /* 7 vars */ <unfinished ...>
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} ---
12    <... execve resumed>)             = 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=1, si_stime=1} ---
10    +++ exited with 0 +++