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]: ['8301', 'd', 'p', 'l', 'm', '9099', 'o', '8045', 'e', 's', 't', '8853', 'v', '6375', 'q', '2505', 's', '4219', '3587', 'g', '651', '7129']
[EX A]: d, e, g, l, m, o, p, q, s, t, v

[EX Q]: ['r', 't', '3539', 'z', 't', '6055', 'r', '5787', '8469', 'p', 'h', '9729', 'z', '1637', '5873', 'c', '3597', '4411', 's', 'k', 'q', '6471', '5375', 'e', 'v', 'i', '7425', 'h', '9079', 'd', '1585', '6011', 'x', '5669', '5219', '4951', '4765', '8285', '2811', 'c', '1805', '6463']
[EX A]: c, d, e, h, i, k, p, q, r, s, t, v, x, z

[EX Q]: ['8465', 'q', 'l', 'p', '4281', '6479', '3891', 'd', 'r', 'g', 's', 'm', '9369', '2325', 'r', '55', 'n', 'p', '9275', '775', 'c', 'g', '4771', '3783', 'a', '4855', 'k', '4515', '3325', '3433', '5149']
[EX A]:
a, c, d, g, k, l, m, n, p, q, r, s