elixir, 104 bytes

Result

AC

Duration

2554ms

Code [DL]

f=fn s,i,j,f->t=IO.getn(s,1)
(j||i>0)&&f.(i<50&&j&&t||1,i<50&&t<"T"&&i+1||0,j&&"K"!=t,f)end
f.("",0,0,f)

stdin

                                           T      
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                              K                   

stdout

                                           T      
                                           1      
                                           1      
                                           1      
                                           1      
                                           1      
                                           1      
                                           1      
                                           1      
                                           1      
                                           1      
                                           1      
                                           1      
                                           1      
                                           1      
                                           1      
                                           1      
                                           1      
                              K1111111111111

stderr

strace