a,b,c=gets.split.map &:to_f
if a==0
  if b==0
    if c==0
      puts (-1)
    else
      puts 0
    end
    exit
  end
  puts 1
  puts (-c/b)
  exit
end

d=b*b-4*a*c
if d==0
  puts 1
  puts (-b/2*a)
  exit
end
if d<0
  puts 0
  exit
end
puts 2
s=Math.sqrt(d)/(2*a)
puts (-b/2*a-s)
puts (-b/2*a+s)