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: ['5039', '2227', 't', 'o', '3313', 'm', 'v', '637', '6773', 'v', 'c', 'l', 'y', 'u', '3823', '9669', 'k', 'h', '3589', 'b', 'i', '3833', 's', 'm', '8201', 'u', '3143', 'k', '4111', '9769', '425', '4339', '209', 'c', 'c', '669', '8201', 'u', '7443', '2387', '6919', 'b', 'b', '2873']

Output: b, c, h, i, k, l, m, o, s, t, u, v, y


Input: Consider Input: ['m', '8127', '7519', '4543', '2809', '9855', 'n', '6241', 'w', 'w', 'q', 'w', 'p', '8599', '7819', '3817', 'm', 'q']

Output: m, n, p, q, w


Input: Consider Input: ['2333', 's', '2915', '7249', '3533', '1475', '2791', '8019', 'h', 'j', '6393', 'c', '191', 'a', 'x', 'z', 'q', '5115', '6763', '6787', '9911', '9015']


Output: a, c, h, j, q, s, x, z