from math import sqrt

a, b, c = map(int, input().split())
if a == b == 0:
    if c == 0:
        print(-1)
    else:
        print(0)
elif a == 0:
    print(1)
    print(-c / b)
else:
    d = b**2 - 4 * a * c
    if d < 0:
        print(0)
    elif d == 0:
        print(1)
        print(-b / 2 / a)
    else:
        print(2)
        if b >= 0:
            x = (-b - sqrt(d)) / (2 * a)
            y = -2 * c / (b + sqrt(d))
        else:
            x = (-b + sqrt(d)) / (2 * a)
            y = -2 * c / (b - sqrt(d))
        if x > y:
            x, y = y, x
        print(x)
        print(y)