a, b, c = gets.to_s.split.map{|i| i.to_i }

if a < 0
  a = -a
  b = -b
  c = -c
end

if a == 0 && b == 0
  puts c == 0 ? -1 : 0
elsif a == 0
  puts 1
  printf "%.15f\n", (-c/1.0/b)
else
  d = b ** 2 - 4 * a * c
  if d < 0
    puts 0
  elsif d == 0
    puts 1
    printf "%.15f\n", (-b/2.0/a)
    # ans = Rational( -b, 2 * a)
    # puts "1 #{ans.to_f}"
  else
    if b > 0
      ans1 = (-b - d ** 0.5) / ( 2.0 * a )
      ans2 = ( c * ans1 ) / a
    else
      ans2 = (-b + d ** 0.5) / ( 2.0 * a )
      ans1 = ( c * ans2 ) / a
    end
    # ans1 = (ans1 * 10**14).round / (1.0*(10**14))
    # ans2 = (ans2 * 10**14).round / (1.0*(10**14))
    # ans1, ans2 = ans2, ans1 if a < 0
    puts 2
    printf "%.20f\n", ans1
    printf "%.20f\n", ans2
    # puts "2 #{ans1.to_f} #{ans2.to_f}"
  end
end