Objective:
    To illustrate client server connection using TCP where
               --> client sends a string to main server, the main server forwards the string to Server_A .
               -->The server_A encrypt (just change a to b, bto c and so on.i.e.,ascii value plus 1) and send back to main server.
               -->The main server send the encrypted text to client.





NOTE:
    Run the serverA.java file first ,
        then mainserver.java,
         lastly Client.java.