perl, 96 bytes

Result

AC

Duration

721ms

Code [DL]

print$a=$b=<>;$a=~tr/T/*/;<>;$c=$_,print$a for<>;$_=$a^$b^$c;s/\^ *K|K */'*'x length($&)/e;print

stdin

                                          T       
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                  K               

stdout

                                          T       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                          *       
                                  ********^       

stderr

strace

11    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffd4c171f30 /* 7 vars */) = 0
12    execve("/bin/cat", ["cat", "-"], 0x564ceb949d30 /* 7 vars */) = 0
13    execve("/usr/bin/perl", ["/usr/bin/perl", "/volume/CODE"], 0x564ceb949d40 /* 7 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=0} ---
11    +++ exited with 0 +++