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]: ['5611', 'x', 't', 'p', '5711', '7079', '5251', '429', 'z', 'u', '8721', '9321', '79', 'i', '189', '3605', 'k', '445', 'r', 'k', 'o', '2189', '8521', '8849', '2651', 'm', '4149', '1577', '3085', '5275', '6413', '5265', '6089', 'r', 'f', '5013']
[EX A]: f, i, k, m, o, p, r, t, u, x, z

[EX Q]: ['f', '165', 'm', '9975', '9259', '6505', 'a', 'g', 's', '1127', 'h', 'n', 'c', '6475', 'c', '8657', 'a', '4057', 'm', 'y', 'w', 'm', '6567', '7297', '285']
[EX A]: a, c, f, g, h, m, n, s, w, y

[EX Q]: ['4373', '2179', 'f', 'g', 'v', '6399', '1111', '3227', '6275', 'z', '9653', 'p', '3073', 'o', '153', 'l', 'j', '803', 'f', 'a', 'f', '3059', '9063', 'x', 'h', '6067', 'h', 'l', 'g', '1149', 'l', 'e', '5853', '1583', '8457', 'n', 'm', '5831', 'j', '8975', 's', 'm', 'j', '433']
[EX A]:
a, e, f, g, h, j, l, m, n, o, p, s, v, x, z