def send_query(str)
  STDOUT.puts(str)
  STDOUT.flush

  res = gets.chomp

  if res == "Merry Christmas!"
    -1
  else
    res.to_i
  end
end

v = gets.to_i
v.times do
  res = send_query("F")
  exit if res == -1
end

send_query("R")
step_cnt = 0

loop do
  res = send_query("L")

  if res > 0 && step_cnt > 1000
    res.times do
      f = send_query("F")
      exit if f == -1
    end

    send_query("R")
    step_cnt = 0
    next
  end

  if res > 0
    f = send_query("F")
    step_cnt += 1

    if f < 0
      exit
    end
  else
    f = send_query("R")

    if f > 0
      r = send_query("F")
      step_cnt += 1
      if r < 0
        exit
      end
    else
      send_query("R")
    end
  end
end