element, 47 bytes

Result

AC

Duration

687ms

Code [DL]

!_0;_1;{0~`_2:1~=}0~`(?{0~(`0;(\ =}0~1?{K`(\ =}

stdin

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          K                                       

stdout

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          KKKKK

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffe37c89190 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "/volume/CODE"], 0x55b5b4e5ed10 /* 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} ---
13    execve("/usr/bin/perl", ["perl", "/root/element.plx", "!_0;_1;{0~`_2:1~=}0~`(?{0~(`0;(\\"...], 0x55b5b501e090 /* 7 vars */) = 0
12    execve("/bin/cat", ["cat", "-"], 0x55b5b4e5ed60 /* 7 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=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} ---
10    +++ exited with 0 +++