Segment in a coordinate system#1353
Given a segment with endpoints x_1, y_1, x_2, y_2. In which coordinate quadrants does the segment lie?
One line contains four integers x_1, y_1, x_2, y_2 (-50 \leq x_1, y_1, x_2, y_2 \leq 50).
Print in ascending order the numbers of the quadrants in which the segment lies. Print each number on a new line, or 0 if the segment lies on the coordinate axis.
Example 1