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.

Input: Consider Input: ['7653', 'n', '697', '4565', 't', '7275', '2429', '1365', '7059', 'o', '8053', 'j', '2837', '957', '851', 'z', 'd', 'd', 'y', 'c', '7467', 'o', 'i', '9519', 'q', 'g', '7911', 't', 'g', '3439', '5821', '8433', 'k', 'z', 's', 'g', '685', 'i', 't', 'r', '6881']

Output: c, d, g, i, j, k, n, o, q, r, s, t, y, z


Input: Consider Input: ['x', 'j', '9747', 'i', '2015', '3505', 'q', 'n', 'h', '3011', 'u', '8043', 'j', 'f', 'd', 'a', 'p', '5817', 'l', 'q', '2275', 'n', '7085', '5373', 'l', 'g', 'b', '8043', '3085']

Output: a, b, d, f, g, h, i, j, l, n, p, q, u, x


Input: Consider Input: ['1601', '1711', 'm', 'p', 'e', '5965', 'u', '7245', 'r', '6691', '7961', '3013', 's', '8735', 'c', '1105', '3823', '5473', 'x', '6843', '6081', 'l', '9033', '3453', 'g', '649', 'v', 'm', '7823', 'g']


Output: c, e, g, l, m, p, r, s, u, v, x