Table schema:
CREATE TABLE table_20181270_3 (landesliga_mitte VARCHAR, landesliga_süd VARCHAR, landesliga_nord VARCHAR)

Question: Name the landesliga mitte for fc gundelfingen and vfl frohnlach
SQL: SELECT landesliga_mitte FROM table_20181270_3 WHERE landesliga_süd = "FC Gundelfingen" AND landesliga_nord = "VfL Frohnlach"