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: ['p', '2923', 'e', 'k', '5433', '605', '5079', 'k', 'p', 'x', '4845', '4099', '6795']

Output: e, k, p, x


Input: Consider Input: ['v', '2989', 'z', '7843', 'e', '9923', 'y', 'b', '7611', 'u', 'u', '6227', '3145', 'w', '6451', 'g', '3129', 'o', 'r', 'z', '8349', 'u', 'h', 'd', 'g', 'a']

Output: a, b, d, e, g, h, o, r, u, v, w, y, z


Input: Consider Input: ['8589', 'k', '2771', 'l', 'm', 'k', 'g', 'x', '6695', '3607', '3389', '6121', 'y', 'z', '9381', '1637', '9563', '9555', 'l', 'q', 't', '2763', 'r', '6019', 'h', 'g', 'j', 'd', 'e', '7863', 'h', 'q', '3203', '3345']


Output: d, e, g, h, j, k, l, m, q, r, t, x, y, z