# Original Data
2006-05-31,1
2006-05-31,2
2006-05-31,3
2006-05-31,3
2006-05-31,4
2006-05-31,4
2006-05-31,4
2006-05-31,5
2006-05-31,5
2006-05-31,5
2006-05-31,6
2006-05-31,6
2006-05-31,6
2006-05-31,7
2006-05-31,7
2006-05-31,8
2006-05-31,9
2006-05-31,11
2006-05-31,13
2006-05-31,13
2006-05-31,14
2006-05-31,14
2006-05-31,14
2006-05-31,15
2006-05-31,16
2006-05-31,17
2006-05-31,18
2006-05-31,19
2006-05-31,22
2006-05-31,23
2006-05-31,23
2006-05-31,23
2006-05-31,24
2006-06-01,2
2006-06-01,3
2006-06-01,4
2006-06-01,5
2006-06-01,6
2006-06-01,6
2006-06-01,7
2006-06-01,7
2006-06-01,8
2006-06-01,8
2006-06-01,9
2006-06-01,9
2006-06-01,10
2006-06-01,11
2006-06-01,11
2006-06-01,12
2006-06-01,12
2006-06-01,13
2006-06-01,14
2006-06-01,14
2006-06-01,15
2006-06-01,15
2006-06-01,15
2006-06-01,15
2006-06-01,16
2006-06-01,16
2006-06-01,16
2006-06-01,17
2006-06-01,17
2006-06-01,17
2006-06-01,18
2006-06-01,18
2006-06-01,19
2006-06-01,19
2006-06-01,19
2006-06-01,19
2006-06-01,20
2006-06-01,20
2006-06-01,20
2006-06-01,21
2006-06-01,21
2006-06-01,24

Need the following
2006-06-01,24 to be the first line and
2006-06-01,21 the second
...
2006-06-01,2
2006-05-31,24
2006-05-31,23
...
2005-05-31,1 to be the last line