What position did Lou Brock primarily play?

Which player was nicknamed "The Machine"? What position did Yadier Molina primarily play? Yadier Molina is best known for playing with which MLB team? What uniform number did Yadier Molina wear with the Cardinals? Lou Brock is best known for playing with which MLB team? What uniform number did Lou Brock wear with the Cardinals? What uniform number did Ernie Banks wear with the Cubs? What position did Ryne Sandberg primarily play?