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: ['l', '1213', 'm', 'k', '7825', '3501', '2397', '2313', 'v', '4119', 'h', 't', '6137', 'l', '9851', 'q', '9661', 'b', 'z', '1437', '1759', 'l', '611', '5085', '4443', 'n', 'u', 'b', '2511', '6023', '7157', 'n', '9921', 'o', 'a', 'o', 'w', 't', 'o', '1607', '6751', 'n', 'b']

Answer: a, b, h, k, l, m, n, o, q, t, u, v, w, z


Question: ['f', '7573', '2067', 'n', '3671', '7969', '7889', '4893', '6501', 'l', 'y', '4331', 'a', 'e', '2081', '3863', 't', 'j', '7921', 's', '7203', '7797', 'f', '4279', '1299', '987', '5003', '9071', '9559', '6061', '1889', '2653', 'm', 'w', '665', '7343', '9763', 'r', '6343', '9393', '9289']

Answer: a, e, f, j, l, m, n, r, s, t, w, y


Question: ['j', '3921', 'm', '8265', 'a', 'a', '9887', '6513', 'i', 'l', '9325', 'f', 'o', '6101', '9675', '6607', '1737', '2021', 'n', 's', 'j', 'b', '7999', 'k', 'j', 's', 's', 'l', 'l', 'q', 'c', 'f', 'x', 'm', '3197', '997', 'j', '6247', 'r', '233']

Answer:
a, b, c, f, i, j, k, l, m, n, o, q, r, s, x