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: ['A', 'z', '8605', '829', 'N', 'W', '5123', 'H', '6249', 'H', '1637', 'r', 'v', 'M', 'F', '3829', '2829', 'I', '5133', 'o', 'b', '677', 'U', 'n', 'x', 'i', 'l', '4137']

1, 26, 8605, 829, 14, 23, 5123, 8, 6249, 8, 1637, 18, 22, 13, 6, 3829, 2829, 9, 5133, 15, 2, 677, 21, 14, 24, 9, 12, 4137