golfish, 74 bytes

Result

AC

Duration

944ms

Code [DL]

00000000  d0 e2 80 01 e1 07 10 d1  e2 ed 14 d8 80 e2 c0 08  |................|
00000010  06 d1 e1 80 e1 e2 ed 20  da 01 80 e0 e0 00 c0 ed  |....... ........|
00000020  ec e2 d1 01 e2 80 c0 e3  07 11 e2 ed 00 14 d8 e1  |................|
00000030  80 81 20 da 00 01 e1 e2  ed 80 e3 08 06 d1 10 ec  |.. .............|
00000040  c1 e1 80 12 c2 33 d1 e1  ff 06                    |.....3....|
0000004a

stdin

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      K                                           

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      11111111111

stderr

/root/golfish/golfish.rb:280: warning: constant ::Fixnum is deprecated

strace

11    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffdd2380810 /* 9 vars */) = 0
12    execve("/bin/cat", ["cat", "-"], 0x564a955ed068 /* 9 vars */ <unfinished ...>
13    execve("/usr/local/ruby-2.6.3/bin/ruby", ["/usr/local/ruby-2.6.3/bin/ruby", "/root/golfish/golfish.rb", "/volume/CODE"], 0x564a955ed090 /* 9 vars */ <unfinished ...>
12    <... execve resumed> )            = 0
13    <... execve resumed> )            = 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=13, si_stime=2} ---
11    +++ exited with 0 +++