Sorting help needed

Ref. Attached DroughtPrint

Column A has survey numbers and i want to sort them in ascending order from 1-1a, 1-1b, 2-2a............... like that. But unable to do so. for example the out put is 250, 349, 1-4, 1-5. In some instances 113-10, then comes 113-4.

Pls help.