abc, 142 bytes

Result

AC

Duration

973ms

Code [DL]

READ a RAW
PUT "" IN b
WHILE "K"#b=0:
  READ b RAW
  WRITE a/
WHILE a|1=" ":
  WRITE b|1
  PUT a@2 IN a
  IF b|1=" ":
    PUT b@2 IN b
WRITE b

stdin

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         K                                        

stdout

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         KKKKKKKK                                        

stderr

strace

11    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffe8b6fe570 /* 8 vars */) = 0
12    execve("/bin/cat", ["cat", "-"], 0x561b1f79abd8 /* 8 vars */) = 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} ---
14    execve("/root/ABC/abc", ["/root/ABC/abc", "/volume/CODE"], 0x561b20f2b758 /* 8 vars */ <unfinished ...>
13    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
14    <... execve resumed> )            = 0
14    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
11    +++ exited with 0 +++