def main():
    import sys
    from math import sqrt
    input = sys.stdin.readline

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

    if a == b == c == 0:
        print(-1)
        exit()
    if a == b == 0:
        print(0)
        exit()
    if a == 0:
        print(0)
        print(-c / b)
    D = b**2 - 4*a*c
    if D < 0:
        print(0)
    elif D == 0:
        print(1)
    else:
        print(2)
        eps = 10**-11
        if a < 0:
            a *= -1
            b *= -1
            c *= -1
        L = -b / (2*a)
        ok = 10**10
        ng = L - eps
        mid = (ok+ng) / 2
        while ok - ng > eps:
            if a * mid**2 + b*mid+c > 0:
                ok = mid
            else:
                ng = mid
            mid = (ok+ng)/2
        x_plus = ok

        ok = -10 ** 10
        ng = L + eps
        mid = (ok + ng) / 2
        while ng - ok > eps:
            if a * mid ** 2 + b * mid + c > 0:
                ok = mid
            else:
                ng = mid
            mid = (ok + ng) / 2
        x_minus = ok

        print(x_minus)
        print(x_plus)


if __name__ == '__main__':
    main()