vim, 41 bytes

Result

AC

Duration

754ms

Code [DL]

:%s/.\(.\)\1 .*/\1/
:%s/.* \(.\).*/\1/
ZZ

Disassembly

:%s/.\(.\)\1 .*/\1/<NL>:%s/.* \(.\).*/\1/<NL>ZZ

stdin

262 621
944 422
681 115
676 472
854 448
277 477
729 382
511 511
945 443
277 719
767 663
458 577
738 836
734 481
566 665
233 334
911 664
448 841
477 223
979 229
451 519
565 642
677 427
844 576
213 411
279 697
158 563
749 316
773 936
233 881
816 686
254 114

stdout

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

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffda99fb450 /* 9 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x559b254ced00 /* 9 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    execve("/usr/bin/vim", ["/usr/bin/vim", "-N", "-u", "NONE", "-i", "NONE", "-s", "/volume/CODE", "/tmp/out"], 0x559b26a65288 /* 10 vars */) = 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=1} ---
13    execve("/bin/cat", ["cat", "/tmp/out"], 0x559b254cec98 /* 9 vars */) = 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=0, si_stime=0} ---
14    execve("/bin/rm", ["rm", "/tmp/out"], 0x559b254cec98 /* 9 vars */) = 0
14    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
10    +++ exited with 0 +++