CREATE TABLE table_203_391 (id DECIMAL, "season" TEXT, "greek league" TEXT, "greek cup" TEXT, "europe" TEXT, "coach" TEXT, "roster" TEXT)

what was the number of players on the roster in 1952-53 ?
SELECT "roster" FROM table_203_391 WHERE "season" = '1952-53'
SELECT "roster" FROM "table_203_391" WHERE "season" = '1952-53'