A, B, C = gets.split.map(&:to_i)

if A == 0 && B == 0 && C == 0
  puts -1
elsif A == 0 && B == 0
  puts 0
elsif A == 0
  puts 1
  puts "%.12f" % Rational(-C, B)
else
  e = B ** 2 - 4 * A * C

  if e == 0
    puts 1
    puts "%.12f" % Rational(-B, 2 * A)
  elsif e < 0
    puts 0
  else
    puts 2
    x = if B > 0
          Rational(-B - Math.sqrt(e), 2 * A)
        else
          Rational(-B + Math.sqrt(e), 2 * A)
        end
    y = Rational(C, A * x)
    puts "%.12f" % [x, y].min
    puts "%.12f" % [x, y].max
  end
end