perl, 106 bytes

Result

AC

Duration

712ms

Code [DL]

print$a=$b=<>;$a=~tr/T/*/;<>;$c=$_,print$a for<>;$_=$a^$b^$c;s/\^ *K|K *\^/'*'x length($&)/e;tr/5/K/;print

stdin

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       K                                          

stdout

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       *******                                    

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffd843342c0 /* 7 vars */) = 0
12    execve("/usr/bin/perl", ["/usr/bin/perl", "/volume/CODE"], 0x555f13ab8d40 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x555f13ab8d30 /* 7 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} ---
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} ---
10    +++ exited with 0 +++