python3, 40 bytes

Result

WA

Duration

2764ms

Code [DL]

for s in open(0):print(s[s.index(s[2])])

stdin

256 562
922 628
541 116
159 443
155 336
892 128
722 418
663 355
611 135
248 445
147 215
977 551
253 589
611 116
547 118
393 974
963 959
847 743
489 995
941 845
322 228
733 581
314 433
957 686
971 775
356 869
688 876
184 846
331 637
514 413
433 235
642 277

stdout

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

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7fff3ac51c80 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x55a8ba285d38 /* 7 vars */) = 0
12    execve("/usr/bin/python3", ["/usr/bin/python3", "/volume/CODE"], 0x55a8ba285d50 /* 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} ---
12    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=0, si_utime=2, si_stime=0} ---
10    +++ exited with 0 +++