Write a SOQL query to find all Contacts whose LastName starts with 'S' and ends with 'a'.

Use LIKE with a prefix and suffix pattern. % matches any number of characters, _ matches exactly one.

SELECT Id, FirstName, LastName FROM Contact WHERE LastName LIKE 'S%a'

Note that LIKE in SOQL is case-insensitive, and a leading wildcard (like %a) alone would make the query non-selective.