recurse, 113 bytes

Result

AC

Duration

803ms

Code [DL]

$v
>8{}m}v#
#T@$# ?#
#%^s!{<<
$^

Tv
>T!]?!?A{}m{}7<
T^

Av
>#@{s}1@d{!?}}]<
#    v[<   }!]<#
#A<  @{1}s{   ^#
A^

stdin

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                    K                             

stdout

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                    K111111111110

stderr

Traceback (most recent call last):
  File "/root/recurse.py", line 221, in <module>
    rr.run()
  File "/root/recurse.py", line 84, in run
    rr = self.executeInstruction()
  File "/root/recurse.py", line 182, in executeInstruction
    bb = self.right.pop()
IndexError: pop from empty list

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffce352fda0 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x5638f40f8d60 /* 7 vars */) = 0
12    execve("/usr/bin/python", ["/usr/bin/python", "/root/recurse.py", "/volume/CODE"], 0x5638f5882068 /* 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    +++ exited with 1 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=1, si_utime=11, si_stime=2} ---
10    +++ exited with 1 +++