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]: ['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]: ['7677', '4069', 'b', 'w', '4381', 'b', '5757', '711', '765', '8347', '6547', '9527', '945', '5333']
[EX A]: b, w

[EX Q]: ['t', '5047', '3063', '8805', 'q', 'i', '1837', '6699', 't', '5325', '13', '6749', 'r', '7647', '73', '4905', '4157', 'z', '9391', '819', 'c', 'p', '4263', 'i', '5813', 'j', '2043', '1637', '2605', 'd', '6559', 'l', 'z', '7939', '4391', '8743']
[EX A]:
c, d, i, j, l, p, q, r, t, z