import java.util.*;

class UniqueList<T> {
    private List<T> elems = new ArrayList<T>();

    public void uniqueAdd(T elem) throws AlreadyContainsException {
	if (elems.contains(elem)) 
	    throw new AlreadyContainsException("Already in the list: " + elem);
	else
	    elems.add(elem);
    }
}