Steps:
1. Go to Home Page
2. Scroll Down
3. Click Donate Button
4. Go to Private Donations
5. Select Pay Each Month
6. Fill out the First Name, Last Name
7. Observe 

Actual:	Verify the First Name, Last Name 	

Expected: First Name and Last Name should only entering alphabets value	

Screenshot: https://screencast-o-matic.com/watch/c3fheZVqwWO