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: ['c', '6027', 'o', 'h', 'l', '7893', 'u', 'f', '7661', '4715', '1373', '4799', 'd', 'z', '411', '4753', 'd', '8241', '1589', '4173', '3921', 'j', 'o', '5067', '8879', 'e', 'm', '9543', '9625', '855', 'u', 'd', '5859', '4243', '5747', '5147', '7315', 'd', 'x', 'q', '7841', '7397', 'm']

Output: c, d, e, f, h, j, l, m, o, q, u, x, z


Input: Consider Input: ['2799', '7519', '345', 'e', 'l', '9369', '4703', '4111']

Output: e, l


Input: Consider Input: ['495', 'y', '4459', 'e', 'x', '7611', 'y', 'n', '4295', '781', '8053', '2255', '413', 'r', '4799', 'v', 'q', 'n', '4817', 'n', 't', '5597', 'b', 'b', 'j', 'v', 'u', 'i', 'j', '9277', '9561', 'l', '9533', 'e', 'g']


Output: b, e, g, i, j, l, n, q, r, t, u, v, x, y