You are given two set of points. The first set is determined by the equation A1x + B1y + C1 = 0,
and the second one is determined by the equation A2x + B2y + C2 = 0.
Write the program which finds the number of points in the intersection of two given sets.
The first line of the input contains three integer numbers A1, B1, C1 separated by space. The second line
contains three integer numbers A2, B2, C2 separated by space. All the numbers are between -100 and 100, inclusive.
Print the number of points in the intersection or -1 if there are infinite number of points.