Pattern, Pattern, Where For Art Thou Pattern: 2nd Edition

Here is your much anticipated problem of the week.

Here the letters A through H have been classified with the digits 1, 3, and 5.  Discover the pattern and classify the rest of the letters in the alphabet.  Be sure to state what the pattern is along with your answer.

1:  A  E  F  H

3:  C           

5:  B  D  G 

 

Good Luck and Enjoy!  Answer will be posted Sunday!

Sincerely,
The Math Freak