Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['8555', '6463', 'j', '9549', '6431', '8735', 'q', '5601', '4913', '159', 'L', 'q', '8019', '1985', 'R', '6281', '123', 'q', '5171']

8555, 6463, 10, 9549, 6431, 8735, 17, 5601, 4913, 159, 12, 17, 8019, 1985, 18, 6281, 123, 17, 5171