@nithishguptak
The Min function is not going to be any help to you in this case as you are dealing with Characters and not Numbers.
You will need to sort the values in order to get what you want.
Ex.
First(Sort([DataCardValue32.Selected.Value, DataCardValue38.Selected.Value], Value)).Value
Will give you the minimum value and:
Last(Sort([DataCardValue32.Selected.Value, DataCardValue38.Selected.Value], Value)).Value
Will give you the maximum value.
I hope this is helpful for you.