 The decoration of the elongated north and south walls includes brick blind arches in the bottom part and a large arch for each wall adjacent to the dome with a <unk> window in the middle . There are windows above the lower arches of the north and south facade . The dome , which also exhibits a large number of ornamental details and ceramics , features eight windows , one for each of its sides . The medieval frescoes which were painted on the interior walls of the church have been only <unk> preserved . 
