python3, 98 bytes

Result

ERROR

Code [DL]

i=input().find('T')
d=-1
while 1:
 print(' '*d+'*'*(i-d+1)if~d else' '*i+'*')
 d=input().find('K')

stdin

                                              T   
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                  K               

stdout

stderr

strace