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
    print(2)
    if b == 0 then
      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 z = v / 2 - v * v / 8
        local v = 1 + z
        local x = b * (-1 - v) / 2 / a
        local y = b * z / 2 / a
        if y < x then x, y = y, x end
        print(string.format("%.13f", x))
        print(string.format("%.13f", y))
      elseif math.abs(1 + v) < 0.00001 then
        local zt = bt * bt - 4LL * at * ct
        local zstr = tostring(zt):gsub("LL", "")
        local zn = tonumber(zstr)
        local diff = math.sqrt(zn) / 2 / a
        local base = -b / 2 / a
        local x = base - diff
        local y = base + diff

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