Program a robot to search for a target, '
You have to find one of the shortest paths from the start marker to the end marker. Only moves between adjacent grid squares are allowed; adjacent means that the grid squares share an edge and are not separated by a wall. It is not allowed to leave the grid.
The input consists of several test cases. Each test case consists of five lines. The first line contains the column and row number of the square with the start marker. The second line contains the column and row number of the square with the end marker. The third, fourth, and fifth lines specify the locations of the three walls. The location of a wall is specified by either the position of its left end point followed by the position of its right end point (in case of a horizontal wall) or the position of its upper end point followed by the position of its lower end point (in case of a vertical wall). The position of a wall end point is given as the distance from the left side of the grid followed by the distance from the upper side of the grid.
You may assume that the three walls don't intersect with each other, although they may touch at a corner of a cell, and that the wall end points are on the grid. Moreover, there will always be a valid path from the start marker to the end marker. Note that the sample input specifies the maze in the picture above.
The last test case is followed by a line containing two zeros.
For each test case, print the description of the shortest path from the start marker to the
end marker in one line. The description should specify the direction of every move
There can be more than one shortest path, in this case you can print any of them.
Output for Sample Input
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