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: ['o', '1217', '449', 'n', 'e', 'o', 't', '9043', '1925', '5687', '7197', '7943', 'u', '5053', 'q', 'e', '89', 'l', 'h', '3083', '4295', 'o', 'n', '6309', '743', 'n', 'j', '2105', 's', '6845', 'p', 'p', '1355', '3757', 'v', 'f', '961', '4623', '4633', 'p', '4593', 'p', '7337', 'o', 'u']

Answer: e, f, h, j, l, n, o, p, q, s, t, u, v


Question: ['9783', '3185', '8225', 'u', '1123', 'd', '3453', 'i', '7713', '8457', '8609', 'h', '2767', 'e', '7191', '2929', '1089', '393', 'e', 'd', '11', '9329', '683', '1271']

Answer: d, e, h, i, u


Question: ['2791', '4345', '8925', '4935', '3411', 'n', '4725', 'n', '4377', '7325', '3661', 'v', '7271', 'y', '8947', 'q', 'o', '1563', 's', 'j', 'o', '6431', '4613', 'j', 's', '5513', '4117', 'k', 'w']

Answer:
j, k, n, o, q, s, v, w, y