erlang, 144 bytes

Result

AC

Duration

1585ms

Code [DL]

%%!
f(S)->case string:chr(io:get_line(S),$K)of
0->f(S);J->io:format("~*c~*c",[J-1,$ ,1+string:chr(S,$T)-J,$*])
end.
main(_)->f(io:get_line("")).

stdin

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         K                                        

stdout

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         *****************

stderr

strace