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: ['5163', 'n', 'j', '67', '3801', 'n', '7113', 'z', '579', '6885', '8921', 'v', '5481', '5507', 'k', '8403', 'c', '837', 'u', '6341', 'd', 'i', '497']

Output: c, d, i, j, k, n, u, v, z


Input: Consider Input: ['5973', 'h', '4081', 'i', '8059', 'w', 'j', '6175', 'w', '8685', '5811', 'k', 'n', '5577', '9817', 'v', '8617', 'u', 'y', '3921', 'b', '1027', '5405', 'a', '3501', '6659', 's', 'e', '157']

Output: a, b, e, h, i, j, k, n, s, u, v, w, y


Input: Consider Input: ['2993', 'u', 'x', '1913', 'g', 'i', '7909', 'f', '2003', 'f', 'p', 'i', '4115', 'i', 'p', '1113', '4821', 'g', '737', '6747', 'h', '6723', 'i', 'n', 'w', 'y', '927', '2631', '9791', '6121', '3739', '8923', '4827', 'u', 'l', '1987', '7725', 'a', 'm', 'm', '7091', '9829', '6571', '7077', 'h']


Output: a, f, g, h, i, l, m, n, p, u, w, x, y