def h(x,y)
	puts (x<0?y<0?'':?-:y<0??-:'')+(?0*100+"#{x.abs/y.abs}").sub(/.{100}$/){".#$&"}.sub(/^0*\B/){''}
end

def f(x,y)
	h(x*10**100,y)
end

def g(x,y,z)
	t=(0..10**200).bsearch{|t|t*t>=10**200*y.abs}
	h(x*10**100+(y<0?-1:1)*t,z)
end

a,b,c=gets.split.map &:to_i
if a==0
	if b==0
		if c==0
			p -1
		else
			p 0
		end
	else
		p 1
		f(-c,b)
	end
else
	d=b*b-4*a*c
	if d>0
		p 2
		if a>0
			g(-b,-d,2*a)
			g(-b,d,2*a)
		else
			g(-b,d,2*a)
			g(-b,-d,2*a)
		end
	elsif d==0
		p 1
		f(-b,2*a)
	else
		p 0
	end
end