a, b, c = [int(i) for i in input().split()]
if a == 0:
    if b == 0:
        print(-1)
    else:
        print(1)
        print(-c / b)
else:
    d = b * b - a * c * 4
    if d == 0:
        print(1)
        print(-b / (2 * a))
    elif d > 0:
        print(2)
        d **= 0.5
        ans1 = 2 * c / (-b + d)
        ans2 = 2 * c / (-b - d)
        print(min(ans1, ans2))
        print(max(ans1, ans2))
    else:
        print(0)