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: ['2989', 'x', 'K', '7261', 'v', '3339', '6059', 'b', '9165', 'c', '9013', 'C', 'j', 'a', 'C']

2989, 24, 11, 7261, 22, 3339, 6059, 2, 9165, 3, 9013, 3, 10, 1, 3