arcyou, 117 bytes

Result

AC

Duration

1169ms

Code [DL]

(: x 1)(r(F(s t)(% "%s%s"(a(a(')s)t)))(f c(q)(pg 0(?(< x 1)"@" c)(: x(?(= c "T")1(?(|(= c "K")(> x 49))(- x 50)(+ 1 x

stdin

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K                                                 

stdout

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K@@@@@@@@@@@@                                     

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffe75561d70 /* 7 vars */) = 0
11    execve("/usr/bin/realpath", ["realpath", "/volume/CODE"], 0x55c6a2a50d18 /* 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/python3", ["/usr/bin/python3", "arc.py", "/volume/CODE"], 0x55c6a440e0f0 /* 9 vars */) = 0
12    execve("/bin/cat", ["cat", "-"], 0x55c6a440e0a8 /* 8 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=21, si_stime=1} ---
10    +++ exited with 0 +++