ruby, 43 bytes

Result

AC

Duration

999ms

Code [DL]

$_,*,c=*$<;c[?K]*=99;puts$_*~-$.,c[0..~/T/]

stdin

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  K                                               

stdout

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  KKKKKKKKKKKKKKKKKKKKK

stderr

strace

11    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffd9fbec850 /* 9 vars */) = 0
12    execve("/bin/cat", ["cat", "-"], 0x56042186ad40 /* 9 vars */) = 0
13    execve("/usr/local/ruby-2.6.3/bin/ruby", ["/usr/local/ruby-2.6.3/bin/ruby", "/volume/CODE"], 0x56042186ad60 /* 9 vars */) = 0
12    +++ exited with 0 +++
11    --- 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 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=0, si_utime=7, si_stime=4} ---
11    +++ exited with 0 +++