local a, b, c = io.read("*n", "*n", "*n")
if a == 0 then
  if b == 0 then
    print(c == 0 and -1 or 0)
  else
    print(1)
    print(string.format("%.13f", -c / b))
  end
else
  local at, bt, ct = 0LL + a, 0LL + b, 0LL + c
  local d = bt * bt - 4 * at * ct
  if d < 0LL then
    print(0)
  elseif d == 0LL then
    print(1)
    print(string.format("%.13f", -b / (2 * a)))
  else
    if b == 0 then
      print(2)
      local z = math.sqrt(-c / a)
      print(string.format("%.13f", -z))
      print(string.format("%.13f", z))
    else
      local v = 4 * a * c / b / b
      if math.abs(v) < 0.00001 then
        local v = 1 + v / x - v * v / 8
        if 0 < v then v = -v end
        print(string.format("%.13f", (-b - v) / 2 / a))
        print(string.format("%.13f", (-b + v) / 2 / a))
        print(2)
      else
        print(2)
        print(string.format("%.13f", (-b - math.sqrt(b * b - 4 * a * c)) / 2 / a))
        print(string.format("%.13f", (-b + math.sqrt(b * b - 4 * a * c)) / 2 / a))
      end
    end
  end
end