CF21B.Intersection

You are given two set of points. The first set is determined by the equation A_1_x + B_1_y + _C_1 = 0, and the second one is determined by the equation A_2_x + B_2_y + _C_2 = 0.

Write the program which finds the number of points in the intersection of two given sets.

给你两组点。第一组点由方程 $A_1x + B_1y + C_1 = 0$ 确定，第二组点由方程 $A_2x + B_2y + C_2 = 0$ 确定。

请编写一个程序，求出这两个给定点集交集中点的个数。

The first line of the input contains three integer numbers _A_1, _B_1, _C_1 separated by space. The second line contains three integer numbers _A_2, _B_2, _C_2 separated by space. All the numbers are between -100 and 100, inclusive.

输入的第一行包含三个用空格分隔的整数 $A_1$、$B_1$、$C_1$。第二行包含三个用空格分隔的整数 $A_2$、$B_2$、$C_2$。所有数字均在 $-100$ 到 $100$ 之间（含端点）。

Print the number of points in the intersection or -1 if there are infinite number of points.

输出交集中点的数量，如果交集中有无穷多个点，则输出 $-1$。