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