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]: ['w', '1367', '5389', '9515']
[EX A]: w

[EX Q]: ['w', 'o', 'l', '5331', 'k', '9325', '6759', '7931', '8185', 'w', 'h', 'h', 'x', '4357', '6845', 'v', 'o', '8401', 'u', 'g', 'f', 'j', 'j', '2493', '4753', 'c', 'm', '1469', '4307', 'm', '2737', 'n', 'y']
[EX A]: c, f, g, h, j, k, l, m, n, o, u, v, w, x, y

[EX Q]: ['2669', 'n', 'p', '5645', 's', '8497', 'i', 'p', '4091', '2367', '9833', 'q', 'a', 'n', 'a', '3001', '7067', 'v', '6535', 'd', 'q', '5261', '6805', 's', '5907', 's', 'u', '9189', 's', '1863', '5397', 'c', 'b', 'v', 'n', '6777', '2325']
[EX A]:
a, b, c, d, i, n, p, q, s, u, v