instruction:
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.
question:
['5161', 'v', 'y', '6005', 'y', 'l', '5451', 'z', 'j', 'd', '4597', '9319', '1241', 'g', 'f', 'b', 'g', '683', '763', 'm']
answer:
b, d, f, g, j, l, m, v, y, z


question:
['3223', 'h', 'w', 'f', 'y', '1667', '8843', '8759', '9203', '3305', '3549', '5507', '6251', 't', '8319', '9121', '6643', 'u', '4273', '4429', '7543', '7909', '789', '9183', '5729', 'd', '7063', 'b', '6677', 'w', 'x', 'x', 'z', '769', 'p', 'd', 'h']
answer:
b, d, f, h, p, t, u, w, x, y, z


question:
['j', 'm', '6321', '7695', 'm', 'e', 'h', 'h', 'm', 'z', 'o', '573', 'e', 'h', 'h', 'z', 'x']
answer:

e, h, j, m, o, x, z