In this task, you are given an input list A comprising of numbers and alphabets. You need to extract and sort the unique alphabets in the list. The alphabets in the input list will only be in lowercase. Return -1 if there is no alphabet in the input list.

[EX Q]: ['i', 'h', '8299', 'e', 'c', '5543', '5241', 'f', '3985', 'f', 'z', '1245', 'e', 't', 'g', '5199', '9217', 'q', 'j', 'p', '767', 'z', '1803', 'k', '7303', '3187', '2507', '6471', '3337', '6037', '9291', 'a', 'l']
[EX A]: a, c, e, f, g, h, i, j, k, l, p, q, t, z

[EX Q]: ['9223', 'w', '8631', '4453', '9975', 'y', '9747', 'g', '7077', '2593', '6015', 'n', '7345', 'i', '7807', '299', 'q', '3629', '2545', 'k', 'm', 'q', '5155', '5633', 'x', 'q', 'i', '27', 'f', '7919', 'p', '4835']
[EX A]: f, g, i, k, m, n, p, q, w, x, y

[EX Q]: ['j', '4909', 't', '6953', '6977', '9557', 'b', 'g', '8427', '1327', 'x', '8897', 'v', '2627', 'z', '1131', '4635', 'c', '9923', '4527', '5187', 's', '6977', '9349', '8761', 'p']
[EX A]:
b, c, g, j, p, s, t, v, x, z