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]: ['3043', 'r', 'm', 'i', '2653', 'i', '1703', '1125', '6299', '4863', 'n', 'h']
[EX A]: h, i, m, n, r

[EX Q]: ['5193', 'h', 'm', '703']
[EX A]: h, m

[EX Q]: ['7045', 'f', '2821', '3523', '5613', 'u', 'u', 'a', '4897', '7177', '8397', 'v', '4465', '149', '1459', 'p', '3393', '5433', 'l', 'f', '1259', 'b', 's', 'l', '637', '2095', '8481', 'm', 'd', '2647', '9245', '5037', '6665', '7425', 'b', 'n', 'd', 'm', '8397', 'u', '4907', 'g', '9973', '6143']
[EX A]:
a, b, d, f, g, l, m, n, p, s, u, v