gs2, 28 bytes

Result

AC

Duration

841ms

Code [DL]

00000000  28 5b 5e 54 5d 7b 35 30  7d 29 2e 07 5c 31 54 9d  |([^T]{50})..\1T.|
00000010  08 04 4b 20 07 4b 4b 9d  09 01 32 32              |..K .KK...22|
0000001c

stdin

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                   K                              

stdout

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                   KKKKKKKKKKKKKKKKKKKKKKKKKKT    

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffdd10f5910 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x55f28c0dfd60 /* 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/python", ["/usr/bin/python", "/root/gs2.py", "/volume/CODE"], 0x55f28de0e068 /* 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=8, si_stime=2} ---
10    +++ exited with 0 +++