fish, 63 bytes

Result

AC

Duration

1063ms

Code [DL]

0v
+>i:o:4%?v8%?:1
>1-1nv:~~<  <
^!?: <-1v?%2^?=a:o:i
:?!;1-1n>

stdin

                              T                   
                                                  
                                                  
                K                                 

stdout

                              T                   
                              1                    
                              1                    
                K11111111111111

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7fff35aa1a10 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x55f73bcded68 /* 7 vars */ <unfinished ...>
12    execve("/usr/bin/python3", ["/usr/bin/python3", "/root/fish.py", "/volume/CODE"], 0x55f73db87068 /* 7 vars */ <unfinished ...>
11    <... execve resumed> )            = 0
12    <... execve resumed> )            = 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 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=0, si_utime=13, si_stime=2} ---
10    +++ exited with 0 +++