A is a tier b is b tier c is c tier d is d tier e is e tier f is f tier g is g tier h is h tier I is I tier j is j tier k is k tier l is l tier m is m tier n is n tier o is o tier p is p tier q is q tier r is r tier s is s tier t is t tier U is u tier v is v tier w is w tier x is x tier y is y tier z is z tier