a, b, c = map(int, input().split())
if a == 0 and b == 0 and c == 0:
    print(-1)
elif a == 0 and b == 0:
    print(0)
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)
    x = []
    x.append((-b - (b ** 2 - 4 * a * c) ** 0.5) / (2 * a))
    x.append((-b + (b ** 2 - 4 * a * c) ** 0.5) / (2 * a))
    x.sort()
    print(x[0])
    print(x[1])