might_be_your_solution

public class AFactory {
    public A create(String name, String otherArgument){/*Create the correct A*/}
    /* ----->
     * But now I receive otherArgument as well and I do nothing with it
     * unless I need to create an instance of B
    */
}

public abstract class A {
    public abstract void doStuff(String argument);
}

public class A1 extends A{
    public void doStuff(String argument){/*some usage of argument*/}
}
.
.
.
public class AN extends A{
    public void doStuff(String argument){/*some usage of argument*/}
}

public class B extends A{
    public void doStuff(String argument){
        /*I need otherArgument too!
         * And it's not in the UserInput class which I
         * cannot change/inherit/modify in any way :|
        */
    }
}

public class Interpreter{
    Interpreter(){}
    public Stuff interpret(UserInput userInput, String otherArgument)
    /* read the user input and do MANY things with the input
     * one of them  might be calling AFactory.create
     * and in the end Runner will get its A instances
    */
    /* ----->
     * But now I hold otherArgument as well and I do nothing with it
     * unless I need to create an A
    */
}

public class Runner{
    public static void run(){
        /* Runner needs otherArgument which B needs but
         * for something else
         */
        for(String argument : listOfArguments){
            for(A actualA : listOfA)
                actualA.doStuff(argument);
        }
    }
}

public class EntryPoint{
    /* Has both UserInput and otherArgument
     * it calls the interpreter.
    */
}