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: ['e', '1251', 'y', '6689', '6389', 'h', 't', '503', '5093', 'e', '923', '7051', 'm', 'u', '4501', '3289', '6887', '8341', 'o', '3671', 'n', 'w', '7749', 's', 'j', 'o', '8429', 'q', 'v', 'p', 'd', 'g', 'i', 'f']

Output: d, e, f, g, h, i, j, m, n, o, p, q, s, t, u, v, w, y


Input: Consider Input: ['3191', '2655', '239', '2585', '3369', '7815', '5919', '8269', '5633', 'x', '8085', '2909', 'y', '2465', 'i', '1579', 'u', '2371', 'l', '1949', '51', 'e']

Output: e, i, l, u, x, y


Input: Consider Input: ['5011', '79', '9533', 'l', 'g', '3785', '6095', 'f', '2573', 'h', 'b', 'r', 'u', '319', 'c', 'z', '9973', '9261', '5279', 'j', '8385', '9161', 'b', 'm', '1883', 'v', 'r', 'e', 'x', 'n']


Output: b, c, e, f, g, h, j, l, m, n, r, u, v, x, z