CF20B.Equation

You are given an equation:

_Ax_2 + Bx + C = 0.

Your task is to find the number of distinct roots of the equation and print all of them in ascending order.

给你一个方程：

$$Ax^2 + Bx + C = 0$$

你的任务是求出该方程的不同实根的个数，并按升序输出所有实根。

The first line contains three integer numbers A, B and C ( - 105 ≤ A, B, C ≤ 105). Any coefficient may be equal to 0.

第一行包含三个整数 $A$、$B$ 和 $C$（$-10^5 \leq A, B, C \leq 10^5$）。任意系数均可为 $0$。

In case of infinite root count print the only integer -1. In case of no roots print the only integer 0. In other cases print the number of root on the first line and the roots on the following lines in the ascending order. Print roots with at least 5 digits after the decimal point.

若方程有无穷多个根，则仅输出整数 $-1$。若方程无根，则仅输出整数 $0$。其他情况下，第一行输出根的个数，随后每行输出一个根（按升序排列）。每个根至少保留小数点后 $5$ 位数字。