perl, 90 bytes

Result

WA

Duration

810ms

Code [DL]

print$a=$b=<>;$a=~tr/T/*/;<>;$c=$_,print$a for<>;$_=$a^$b^$c;s/\^ *K|K */$&=~@ @_@/e;print

stdin

                 T                                
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
  K                                               

stdout

stderr

Bareword found where operator expected at /volume/CODE line 1, near "@ @_"
	(Missing operator before _?)
Array found where operator expected at /volume/CODE line 1, near "_@}"
syntax error at /volume/CODE line 1, near "@ @_"
Missing right curly or square bracket at /volume/CODE line 1, within string
Execution of /volume/CODE aborted due to compilation errors.

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7fffed032c00 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x556646e8fd30 /* 7 vars */) = 0
12    execve("/usr/bin/perl", ["/usr/bin/perl", "/volume/CODE"], 0x556646e8fd40 /* 7 vars */ <unfinished ...>
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    <... execve resumed> )            = 0
12    +++ exited with 255 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=255, si_utime=0, si_stime=0} ---
10    +++ exited with 255 +++