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: ['g', 'x', 'l', 'e', 'd', '1345', '1763', 'm', 'c', '2057', 's', 'a', '4127', 'y', 'h', '8581', 'o', '9203', '4761', 'd', 'u', 'n']
Example Output: a, c, d, e, g, h, l, m, n, o, s, u, x, y

Example Input: ['4787', 'c', '1727', '9863', '8147', '3931', 'b', '1133', '3023', '7427', '7837', 'n', '7921', 'o', 'c', '3973', '1949', 'x', 'g', 'b', 'd', '8559', '8661', '4465', 'z', '369', 'q', 'e', 'y', '8629', '7665', 'i', 'r', 'n', 'z', '9115', '1393', '4899']
Example Output: b, c, d, e, g, i, n, o, q, r, x, y, z

Example Input: ['2123', '8131', '7285', '8403', '5401', 'b', '5409', '7845', 'c', 'p', 'e', '8545', '4473', '5631', '3483', 'q', '8637', '285', '833', '9909', '9205', 'm', 'i', '3695', '7051', '2117', '6083', 'e', 'u', 'e', '7701', '2153', '993', '8115', 'p', '649', '87']
Example Output:
b, c, e, i, m, p, q, u