Problem:

List1 (column A) consists of strings composed of numbers and characters.
Numbers may appear at the beginning or the end of the string, but not in the middle.
For each of the strings, we want to determine whether the numbers appear at the beginning or the end.

Solution:

Use the ISNUMBER, RIGHT, and LEFT functions as shown in the following formula:
=IF(ISNUMBER(-RIGHT(A2,1)),\"End\",IF(ISNUMBER(-LEFT(A2,1)),\"Beginning\"))