bash-pure, 67 bytes

Result

WA

Duration

1073ms

Code [DL]

while read l;do
[ ${l:1:1} = ${l:2:1} ]a=2||a=4
echo ${l:$a:1}
done

stdin

635 532
263 117
465 652
385 814
435 276
177 597
438 933
322 262
412 213
488 893
988 385
756 863
514 118
213 334
377 968
455 157
964 669
566 668
312 457
532 429
652 652
179 552
955 386
388 334
582 265
547 461
913 331
937 725
511 118
925 118
788 447
154 543

stdout

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

stderr

/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'
/code.bash: line 2: [: missing `]'

strace

12    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffce0a81010 /* 9 vars */) = 0
13    execve("/usr/bin/realpath", ["realpath", "/volume/CODE"], 0x563dec4a0d18 /* 9 vars */) = 0
13    +++ exited with 0 +++
12    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
14    execve("/bin/cp", ["cp", "-f", "/volume/CODE", "/opt/jails/bash-pure/code.bash"], 0x563dec4a0d58 /* 9 vars */) = 0
14    +++ exited with 0 +++
12    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
16    execve("/usr/sbin/jk_chrootlaunch", ["jk_chrootlaunch", "-j", "/opt/jails/bash-pure", "-x", "/bin/bash", "/code.bash"], 0x563dec4e31c0 /* 9 vars */) = 0
15    execve("/bin/cat", ["cat", "-"], 0x563dec4e30d8 /* 9 vars */) = 0
15    +++ exited with 0 +++
12    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=15, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
16    execve("/bin/bash", ["/bin/bash", "/code.bash"], 0x7ffe35bb4460 /* 9 vars */) = 0
16    +++ exited with 0 +++
12    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=16, si_uid=0, si_status=0, si_utime=1, si_stime=0} ---
17    execve("/bin/rm", ["rm", "/opt/jails/bash-pure/code.bash"], 0x563dec4a0cb8 /* 9 vars */) = 0
17    +++ exited with 0 +++
12    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=17, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
12    +++ exited with 0 +++