public Beer getBeer(Brand brand)
	{	
		if( brand == Brand.A && !beers_brand_A.isEmpty() )
		{
			for(Beer beer : beers_brand_A)
			{
				if( beer.getState() == BeerState.ICED )
				{	
					int index = beers_brand_A.indexOf(beer);
					beer.setLocal(Local.OUTSIDE);
					beer.startTimeToWarm();
					return beers_brand_A.remove(index);
				}
			}
		}
		
		if( brand == Brand.B && !beers_brand_B.isEmpty() )
		{
			for(Beer beer : beers_brand_B)
			{
				if(beer.getState() == BeerState.ICED)
				{
					int index = beers_brand_B.indexOf(beer);
					beer.setLocal(Local.OUTSIDE);
					beer.startTimeToWarm();
					return beers_brand_B.remove(index);
				}
			}
		}
		
		return null;
	}