Please list the first names of the coaches who have taught the Montreal Canadiens.
Montreal Canadiens is the name of team.
SELECT DISTINCT T3.firstName FROM Coaches AS T1 INNER JOIN Teams AS T2 ON T1.year = T2.year AND T1.tmID = T2.tmID INNER JOIN Master AS T3 ON T1.coachID = T3.coachID WHERE T2.name = 'Montreal Canadiens'