by@drafear
AC
1973ms
f=fn s,i,j,f->t=IO.getn(s,1) j<=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)
T K
T 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 K111111111111111111111111111111111111111111