elixir, 110 bytes

Result

AC

Duration

1719ms

Code [DL]

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

stdin

                          T                       
                                                  
            K                                     

stdout

                          T                       
                          1                       
            K11111111111111

stderr

strace