Create canvas and then line and rectangle using following commands.

Commands - :

C w h Create a new canvas of width w and height h

L x1 y1 x2 y2 Draw a new line from coordinates (x1, y1) to (x2, y2) horizontally or vertically. Lines are made up of the x character

R x1 y1 x2 y2 Draw a new rectangle, with upper left corner at coordinate (x1, y1) and lower right coordinate at (x2, y2). Lines are made up of the x character

Q Quit the program