python3, 40 bytes

Result

WA

Duration

766ms

Code [DL]

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

stdin

626 827
531 316
366 448
519 997
612 133
664 347
593 133
381 447
154 556
378 852
458 842
223 229
399 981
695 627
816 552
399 154
398 984
441 149
134 738
116 617
677 776
799 895
185 546
966 499
599 339
711 146
564 725
176 414
344 447
489 994
957 561
922 926

stdout

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

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7fff0acc1bd0 /* 7 vars */) = 0
12    execve("/usr/bin/python3", ["/usr/bin/python3", "/volume/CODE"], 0x555680357d50 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x555680357d38 /* 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=0, si_stime=0} ---
10    +++ exited with 0 +++