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