Bridging gap between sink and drain pipe
You should measure the diameter of the pipe (both inside and outside diameter recommended) and then check if similar plumbing supplies in your area are available. You could even take piece "A" with you when you go shopping around. 



What you want to look for is a piece similar to part "A" that comes on two pieces that fit together with a slip joint type of coupling. The following picture is an idea of what you want. The slip joint in the area indicated has a larger diameter so that the upper tail piece from the bottom of the sink can be cut to the right length but still slide in and out of the expanded area for final length adjustment.