vim, 44 bytes

Result

AC

Duration

756ms

Code [DL]

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

Disassembly

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

stdin

611 391
349 976
678 869
251 335
376 674
644 449
598 228
228 723
337 544
951 533
922 285
544 775
165 628
411 615
538 937
322 225
782 321
876 767
566 649
876 772
843 446
445 551
224 422
235 357
871 811
798 291
697 816
388 773
388 984
199 736
267 338
927 778

stdout

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

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffd9af48710 /* 9 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x55bcb4410d00 /* 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"], 0x55bcb4d53288 /* 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"], 0x55bcb4410c98 /* 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"], 0x55bcb4410c98 /* 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 +++