octave, 119 bytes

Result

WA

Duration

923ms

Code [DL]

t=l=fgetl(0);
[i]=strchr(l,"T")
do disp(l);until [t]=strchr(fgets(0),"K")
disp([repmat([' '],1,t),repmat(['*'],1,i-t)])

stdin

                T                                 
                                                  
                                                  
                                                  
    K                                             

stdout

i =  17
                T                                 
                T                                 
                T                                 
                T                                 
     ************

stderr

octave: X11 DISPLAY environment variable not set
octave: disabling GUI features
warning: suggest parenthesis around assignment used as truth value near line 3, column 21 in file '/volume/CODE'

strace