On Wednesday we saw strong numbers from Walgreen with better-than-expected sales in November, led by growth in its pharmacy business. Jim Cramer says he specifically likes that the volume of flu shots was much higher than expected as flu shots are a huge revenue driver. The company says pharmacy sales represented 65% of total sales during the month. Cramer says that there's a lot of room to unlock value in this stock because it's been beat up this year. He adds that some of the recommendations that activist investors are making and easy comparisons next year should propel the stock higher but it's a longer-term play. As Cramer sees improving trends in Walgreen, it could be good opportunity to buy because although it has been beat up, it also has multiple levers it could pull over the next few years.