import java.util.*;

public class SetShipGeneric<T> implements  Iterable<T> {
    private ArrayList<T> _places;
    private final int _maxCount;
    public int getCount() {
        return _places.size();
    }

    public SetShipGeneric(int count)
    {
        _maxCount = count;
        _places = new ArrayList<>();
    }

    public int Insert(T ship)
    {
        return Insert(ship, 0);
    }

    public int Insert(T ship, int position)
    {
        if (position < 0 || position > getCount() || _maxCount == getCount()) return -1;
        _places.add(position,ship);
        return position;
    }

    public T Remove(int position)
    {
        if (position < 0 || position >= getCount()) return null;
        T DelElement = (T) _places.get(position);
        _places.remove(position);
        return DelElement;
    }

    public T Get(int position)
    {
        if (position < 0 || position >= getCount()) return null;
        return _places.get(position);
    }

    public void Set(int position,T value)
    {
        if (position < _maxCount || position >= 0)
        {
            Insert(value, position);
        }
    }

    @Override
    public Iterator<T> iterator() {
        return _places.iterator();
    }
}