perl, 73 bytes

Result

AC

Duration

917ms

Code [DL]

print$a=<>;<>;$c=$_,print$a for<>;$_=$a^$c;tr/\0/ /;0while s/k /kk/;print

stdin

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 K                                                

stdout

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 kkkkkkkkkkkkkkkkkkkkkt                            

stderr

strace