moo, 48 bytes

Result

AC

Duration

723ms

Code [DL]

0{1{i0dn0}id)75=+d(+os1+dr50=c0c}1{ido32=c}0dd1c

stdin

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    K                                             

stdout

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    L!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!0  

stderr

thread 'main' panicked at 'stdin is closed @ 10', src/main.rs:321:25
note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffc7498ada0 /* 8 vars */) = 0
12    execve("/usr/bin/moo", ["/usr/bin/moo", "/volume/CODE"], 0x55ee000c2c28 /* 8 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x55ee000c2c10 /* 8 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    +++ exited with 101 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=101, si_utime=0, si_stime=0} ---
10    +++ exited with 101 +++