Make a server that takes two or three arguments. The first argument is a port number, the second is the name of a file. Start a server on the port, and listen for a connection. The incoming client will send some numbers on this connection; write all incoming numbers to the file in the second argument. If there is a third argument, it will indicate a port number of a similar server; make a connection to it when the program starts, and send every second incoming number to it. When the client exits, stop the program.

Try the program by chaining at least three servers.