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

if not a == 0:
    if b * b - 4 * a * c >  0:
        print(2)
        print((-b - (b * b - 4 * a* c) ** 0.5) / 2 * a)
        print((-b + (b * b - 4 * a * c) ** 0.5) / 2 * a)
    elif b * b - 4 * a * c == 0:
        print(1)
        print(b , 2 * a)
        print(-b / 2 * a)
else:
    if b == 0 and c == 0:
        print(-1)
    elif b == 0 and not c == 0:
        print(0)
    else:
        print(-c / b)