| CUSIP No. 008916108 | SCHEDULE 13D/A | Page 1 of 1 Page |
EXHIBIT A
Transactions in the Shares During the Last 60 Days
The following table sets forth all transactions in the Shares effected in the past sixty days by the Reporting Persons. All such transactions were effected in the open market through brokers and the price per share is net of commissions.
JANA Partners LLC
SHARES
| Trade Date | Aggregate Amount Purchased (Sold) | Average Price per Share ($) |
| 12/27/2012 | 10,264 | 98.26 |
| 12/31/2012 | 62,675 | 99.50 |
| 12/31/2012 | (32,363) | 99.13 |
| 01/09/2013 | 3,940 | 103.93 |
| 01/09/2013 | (404) | 103.99 |
| 01/16/2013 | 709 | 106.18 |
| 01/16/2013 | 20,845 | 106.52 |
| 01/16/2013 | (1,842) | 106.13 |
| 01/22/2013 | 3,160 | 108.67 |
| 01/22/2013 | 42,840 | 109.44 |
| 01/24/2013 | (6,392) | 114.46 |
| 01/30/2013 | 6,760 | 113.96 |
| 01/30/2013 | (11,008) | 113.63 |
| 01/31/2013 | 150,000 | 113.37 |
| 01/31/2013 | 50,000 | 113.66 |
| 01/31/2013 | 54,417 | 113.95 |
| 01/31/2013 | (700) | 113.02 |
| 01/31/2013 | (2,118) | 113.86 |
| 02/06/2013 | 15,781 | 113.65 |
| 02/06/2013 | 11,400 | 113.93 |
| 02/19/2013 | 25,000 | 106.54 |
| 02/19/2013 | 16,000 | 106.65 |
| 02/19/2013 | 412,900 | 107.55 |
| 02/20/2013 | 13,300 | 108.41 |
| 02/20/2013 | 829,140 | 108.63 |
| 02/20/2013 | 47,660 | 108.71 |
| 02/20/2013 | 69,900 | 108.80 |
