Selection Of Rows Using Only Numeric Value Found Out By Formula

The following is how my sample worksheet looks like:

A
10

Count of A's
12

A
1

Count of B's
13

A
24

[code].....

The two count cells, Count of A's & Count of B's have been calculated with the formulas

=COUNTIF(A$1:A$25,"=A") and =COUNTIF(A$1:A$25,"=B") respectively.

Now, my problem is I want to select the cells with only A's or only B's, along with their corresponding values, but I want to select it with the two count values I found above (12 and 13 respectively), because the data I have to work on is subject to change and each time there may be different numbers of A's and B's.