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
    local z = (-b - math.sqrt(b * b - 4 * a * c)) / (2 * a)
    local y = c / a / z
    if math.abs(z) < 0.000001 then
      y = (-b + math.sqrt(b * b - 4 * a * c)) / (2 * a)
      z = c / a / y
    end
    print(2)
    if y < z then z, y = y, z end
    print(string.format("%.13f", z))
    print(string.format("%.13f", y))
  end
end