Coordinates of Neighbors#2670
For a cell with coordinates in a table of size M \times N, output the coordinates of its neighboring cells. Neighboring cells are those that share a side with the specified cell.
Natural numbers M, N, x, y are given, where 1 \leq x \leq M \leq 10^9, 1 \leq y \leq N \leq 10^9.
Print the coordinate pairs of the neighboring cells of the specified cell in any order.
Example 1