Detailed Instructions: 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: ['a', '1105', '6609', 'q', '2217', '1569', '9071', 'c', 'o', 't', '1257', 'b', '295', '3041', '3109', '7031', 'o', 'q', '3305', 'c', '6225', 'h', '9035', '4013', '4887', '2279', '4603', 'h', 'k', 'e', '3321', '7671', '175', 'i', '6307', 'x']
A:
a, b, c, e, h, i, k, o, q, t, x