Write SQL query to solve given problem: What is the party of the legislator named Susan M. Collins?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T2.party FROM current AS T1 INNER JOIN `current-terms` AS T2 ON T1.bioguide_id = T2.bioguide WHERE T1.official_full_name = 'Susan M. Collins' GROUP BY T2.party