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: ['e', 'z', '5199', 'x']

Answer: e, x, z


Question: ['w', '5341', 'b', '6243', 'v', '877', '1087', '6763', '5241', '3369', '9119', 't', 'v', 'j', '8261', 'o', 'b']

Answer: b, j, o, t, v, w


Question: ['5585', '2445', 'm', 'h', '2773', 'i', '7583', 'y', 'x', '1399', '7617']

Answer:
h, i, m, x, y