Will anyone help me with an Excel problem?

I have data in a text format: c,b,a,d,e,
I want to sort that into alphabetical order in column A, ascending, each value on it’s own row without having to do it manually. It’s a large text file.
I can’t figure out how to do it or even if it CAN be done.
If it’s not too much trouble could you please help me? Knowing that it can’t be done would be helpful too.