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.
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Question: ['4743', '9687', '2887', '4413', 'r', 'w', '2355', 'l', 'd', '453', 'o', 'm', '4351', '5881', '3963', 'g', 'r', 'z', 'q', '7555', 'y', '9555', '405', 'n', 'l', '6733', '1763', 'v', '9925', 'y', '633', '827', 'w']

Answer: d, g, l, m, n, o, q, r, v, w, y, z


Question: ['r', 's', '3409', 'a', 'e', '6855', 'i', 'n', '8655', 's', 't', '8401', 'u', '9603', '8815', 'q', 'a', 'x', 'i', '8455', 'e', '5877', '3917', 'p']

Answer: a, e, i, n, p, q, r, s, t, u, x


Question: ['2233', '3241', 'e', '453', '3163', '9369', 'j', 'f', 'c', '1295', 'e', 'j', 'j', '3855', 'h', 'l', 'p', '8299', '5853', '6189', 'r', '3691', 'y', 'k', 'a', 'c', '6235', 'r', '759', '2051', 'h', '8449', 'p', 'h', 'w', 'a', '8167', 'i', '5317', '3509', 't', '3483']

Answer:
a, c, e, f, h, i, j, k, l, p, r, t, w, y