abc, 125 bytes

Result

AC

Duration

870ms

Code [DL]

READaRAW
PUT ""INb
WHILE "K"#b=0:
  READbRAW
  WRITEa/
WHILEa|1=" ":
  WRITEb|1
  PUTa@2INa
  IFb|1=" ":
    PUTb@2INb
WRITEb

stdin

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       K                                          

stdout

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       KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK                                          

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffdad635f00 /* 8 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x5647b4631bd8 /* 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} ---
13    execve("/root/ABC/abc", ["/root/ABC/abc", "/volume/CODE"], 0x5647b61f1758 /* 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=0, si_stime=0} ---
10    +++ exited with 0 +++