a, b, c = map(int, input().split())

if a==0:
    if b==0:
        if c==0:
            print(-1)
        else:
            print(0)
    else:
        print(1)
        print(-c/b)
else:
    if b**2-4*a*c>0:
        print(2)
        print((-b-(b**2-4*a*c)**0.5)/(2*a))
        print((-b+(b**2-4*a*c)**0.5)/(2*a))
    elif b**2-4*a*c==0:
        print(1)
        print(-b/(2*a))
    else:
        print(0)