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: ['q', 'g', 's', 'g', 'z', '987', '777']

Output: g, q, s, z


Input: Consider Input: ['h', '6865', '4019', '8571', 'y', '5575', '7835', '9537', 'n', '875', 't', 'a', 's', '2769', 'p', '1607', 'n', '4087', '961', '7869', '5085', '2131', '4867', 'j', 'h', 'y', '3105', '6609', 's', 'l', '3399', '5013']

Output: a, h, j, l, n, p, s, t, y


Input: Consider Input: ['7559', 'q', 'p', 'n', '4813', '1097', 'q', 'd', '3313', 'h', 'j', '7567', '6613', '803', 'q', '8897', 'i', '6571', 'f', '6267', '4933', 'j', '3891', 't']


Output: d, f, h, i, j, n, p, q, t