import math

def main():
    a, b, c = map(int, input().split())
    print(a, b, c)

    if a < 0:
        a, b, c = -a, -b, -c

    if a == 0 and b == 0:
        if c == 0:
            print(-1)
        else:
            print(0)
        return

    if a == 0:
        print(1)
        print(-c / b)
        return

    t = b * b - 4 * a * c
    if t < 0:
        print(0)
        return
    elif t == 0:
        print(1)
        print(-b / (2 * a))
        return

    t = math.sqrt(t)
    print(2)
    print((-b - t) / (2 * a))
    print((-b + t) / (2 * a))

if __name__ == '__main__':
    main()