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.

[Q]: ['3127', '9253', '5667', '9453']
[A]: -1


[Q]: ['4123', '1397', '103', 'w', 't', 'j', '233', '7239', 'b', 'n', 't', '6273', 'l', '1167', '8389', '5609', '9029', '7741', 'o', 'p', '6547', '5593', 'd', '8401', 's', '4243', 's', 'u', 'm', '6659', '5691', '2105', '8897']
[A]: b, d, j, l, m, n, o, p, s, t, u, w


[Q]: ['2987', '7593', '8385', '993', 'y', 'g', 'f', 'm', 'm', 'l']
[A]:
f, g, l, m, y