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:
    d = b ** 2 - 4 * a * c
    if d > 0:
        print(2)
        print((-b - d ** .5) / (2 * a))
        print((-b + d ** .5) / (2 * a))
    elif d < 0:
        print(0)
    else:
        print(1)
        print(-b / (2 * a))