a = float(input())
b = float(input())
c = float(input())
D = b ** 2 - 4 * a * c
if a == 0:
    if b == 0:
        if c == 0:
            print(3)
        else:
            print(-1)
    else:
        print(1, - c / b)
else:
    if D > 0:
        x1 = (- b - D ** 0.5) / (2 * a)
        x2 = (- b + D ** 0.5) / (2 * a)
        if x1 % 1 == 0:
            x1 = int(x1)
        if x2 % 1 == 0:
            x2 = int(x2)
        if a > 0:
            print(2, x1, x2, sep=' ')
        else:
            print(2, x2, x1, sep=' ')
    elif D == 0:
        x = - b / (2 * a)
        if x % 1 == 0:
            x = int(x)
        print(1, x, sep=' ')
    else:
        print(-1)