rprogn, 59 bytes

Result

AC

Duration

1061ms

Code [DL]

read x =
x w{
x p
read " K" f
] !
}
" " \ m a . 1 x "T" f q

stdin

                      T                           
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
    K                                             

stdout

                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
                      T                           
    abcdefghijklmnopqrs

stderr

strace

11    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7fffaf0a75a0 /* 7 vars */) = 0
13    execve("/usr/bin/lua5.3", ["/usr/bin/lua5.3", "main.lua", "/volume/CODE"], 0x562db21d0068 /* 8 vars */) = 0
12    execve("/bin/cat", ["cat", "-"], 0x562db1d9fd60 /* 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} ---
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=1} ---
11    +++ exited with 0 +++