how to read every nth row in a cell

I read a text and it produced a cell but the numbers in the table i scanned are all over the place. looks something like this.
a1
b1
c1
d1
a2
b2
c2
d2
a3
b3
c3
d3
how do i get all the a, b, c, and ds by themselves. I tried to use a for loop but I am not sure how to go about it.

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me
on 18 Nov 2015

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