import math


def main():
    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 * b - 4 * a * c
        if d < 0:
            print(0)
        else:
            if d != 0:
                p = -b
                q = math.sqrt(d)
                r = 2 * a
                print(2)
                print((p + q) / r)
                print((p - q) / r)
            else:
                print(1)
                print((-b) / (2 * a))


if __name__ == "__main__":
    main()