japt, 29 bytes

Result

AC

Duration

922ms

Code [DL]

r"([^T]\{50}) ""$1T")e"K ""KK

stdin

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      K                                           

stdout

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      KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKT             

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffc8b77e650 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x562497c58cf8 /* 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} ---
12    execve("/usr/bin/node", ["/usr/bin/node", "/root/japt-cli.js", "/volume/CODE", "                                "...], 0x5624988428b0 /* 7 vars */) = 0
17    +++ exited with 0 +++
16    +++ exited with 0 +++
15    +++ exited with 0 +++
14    +++ exited with 0 +++
13    +++ exited with 0 +++
18    +++ exited with 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=11, si_stime=2} ---
10    +++ exited with 0 +++