Row 1: a thru h
Row2: i thru p
Row 3: q thru w
Row 4: y-z A thru D
Row 5: E thru K
Row 6: L thru S
Row 7: T thru Z

Created using 1,2,3 for top frame-4 and 8 for sides-and5,6,7 for bottom. (And lots of playing at gifworks!)