erlang, 143 bytes

Result

AC

Duration

1589ms

Code [DL]

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

stdin

                             T                    
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
          K                                       

stdout

                             T                    
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                             T                    
          A*******************

stderr

strace