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]: ['z', 'l', '1759', 'k', '8197', 'v', '931', '2587', '7219', '3455', 'e', '8135', 'm', 'n', 'm']
[EX A]: e, k, l, m, n, v, z

[EX Q]: ['h', 'u', 'y', '7677', '9441', '1769', 'v', '1433', 'l', '7739', 'a', '8305', 'n', 'a', '6711', '3161', 'e', 'u', '993', '2211', '4011', 'q', 'o']
[EX A]: a, e, h, l, n, o, q, u, v, y

[EX Q]: ['f', 'k', '8523', 'm', '6449', '6007', '7921', 'l', '1131', '9413', 'n', 'b', '229', '2261', '4725', 'c', 'g', 'v', '7255', 'r', 'a', 'k', '7493', 'y', 'o', '4667', '3891', '2891', '1815', '6027', '1645', 'z', '4221', '6623', '1345', 'w', 'k', '2839', 'm']
[EX A]:
a, b, c, f, g, k, l, m, n, o, r, v, w, y, z