elixir, 195 bytes

Result

AC

Duration

1988ms

Code [DL]

f=fn s,x,t,f->
case IO.gets x do
:eof->IO.write String.slice String.trim_trailing(t)<>String.duplicate("*",99),0,String.length String.trim_trailing s
t->f.(s,s,t,f)end
end
f.(IO.gets(""),"","",f)

stdin

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  K                                               

stdout

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          T                                       
  K********

stderr

strace