a,b,c=map(int,input().split())
if a!=0:
    if b*b-4*a*c<0:
        print(0)
    elif b*b==4*a*c:
        print(1)
        print(-b/(2*a))
    elif b*b>4*a*c:
        if b>0:
            ans1=(-b-(b**2-4*a*c)**0.5)/(2*a)
        else:
            ans1=(-b+(b**2-4*a*c)**0.5)/(2*a)
        ans2=c/(a*ans1)
        print(2)
        print(min(ans1,ans2))
        print(max(ans1,ans2))
else:
    if b!=0:
        print(1)
        print(-c/b)
    else:
        if c!=0:
            print(0)
        else:
            print(-1)