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.

Example Input: ['3127', '9253', '5667', '9453']
Example Output: -1

Example Input: ['t', 'c', 'r', '4459', 'o', '1407', 'x', '1515', '331', 'm', '1535', 'p', 'u', 'g', '2513', 'o', '7827', '8149', 'd', 'z', 'q', '5655', 'x', '9997', '2809', 'g', 'h', '6309', 'a', 'j', '9773', '2115', 't', '9113', 'q', 'o', '427', 's', '3815', '5423', 's', 'n', 'i', 'o', '3643']
Example Output: a, c, d, g, h, i, j, m, n, o, p, q, r, s, t, u, x, z

Example Input: ['9693', 'g', 'b', 'j', '105', '6355', 'c', '3301', '291', 'v', '5719', '9539', 'd', '5357', 's', '9457', 'p', '5595', '4189', '2623', 'o', 'd', 'c', 'd', 'z', 's', '2041', 'm', 'w', '9393', 'm', '1159', '1867', '1805', 'a', '4787']
Example Output:
a, b, c, d, g, j, m, o, p, s, v, w, z