This is a simple console version of a drawing program. The functionality of the program is quite limited but should be extensible. The program should work as follows:

1. create a new canvas.
2. start drawing on the canvas by issuing various commands.
3. quit.

The program should support the following commands:

Command	Description
C w h	Should create a new canvas of width w and height h.
L x1 y1 x2 y2	Should create a new line from (x1,y1) to (x2,y2). Currently only horizontal or vertical lines are supported. Horizontal and vertical lines will be drawn using the x character.
R x1 y1 x2 y2	Should create a new rectangle, whose upper left corner is (x1,y1) and lower right corner is (x2,y2). Horizontal and vertical lines will be drawn using the x character.
B x y c	Should fill the entire area connected to (x,y) with colour 'c'. The behaviour of this is the same as that of the "bucket fill" tool in paint programs.
Q	Should quit the program.

Sample I/O

Below is a sample of the output your program should produce. User input is prefixed with enter command:.

enter command: C 20 4
----------------------
|                    |
|                    |
|                    |
|                    |
----------------------

enter command: L 1 2 6 2
----------------------
|                    |
|xxxxxx              |
|                    |
|                    |
----------------------

enter command: L 6 3 6 4
----------------------
|                    |
|xxxxxx              |
|     x              |
|     x              |
----------------------

enter command: R 16 1 20 3
----------------------
|               xxxxx|
|xxxxxx         x   x|
|     x         xxxxx|
|     x              |
----------------------

enter command: B 10 3 o
----------------------
|oooooooooooooooxxxxx|
|xxxxxxooooooooox   x|
|     xoooooooooxxxxx|
|     xoooooooooooooo|
----------------------

enter command: Q