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]: ['9113', '3625', 'u', '8189', '3649', '259', '5539', '1583', 'g', '4037', 'y', 'v', '8337', 'd', 'q', 'j', 'c', 'h', 'p', '1601', 'z', 'c', 'n', '1767', '1679', '1805', 'm', '4469', '2487', '6015', '973']
[EX A]: c, d, g, h, j, m, n, p, q, u, v, y, z

[EX Q]: ['4653', 'e', 'c', 'j', '6739', '3963', 'q', '4649', 'v', 's', 'j', '9757', '8075', '6253', '4365', 's', '9101', 'd', '6989', 't', '5687', '7389', '139', '4029', '5073', 'q', 'e', '2455', '1075', 'j', '1329', 'l', '4689', 't', 'z', '4179', 's', 'l', 'w', 'n', '6569', '8907', 'v', '605', 'y']
[EX A]: c, d, e, j, l, n, q, s, t, v, w, y, z

[EX Q]: ['3883', 'c', '4179', 'c', '9961', '9443', '535', 'v', 'a', 'i', '9691', 'm', '1529', '5697', 'o', 'b', '9139', 'p', '5793', 'q', '9907', '7617', '8689', '5613', '4703', 't', '6659', 'c', 'x', 'j', '3441', 'u', 'w', 'e', '4789']
[EX A]:
a, b, c, e, i, j, m, o, p, q, t, u, v, w, x