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: ['B', 'l', 'n', 'j', 'j', '5043', 'D', 'K', 'K', '1021', '7043']

2, 12, 14, 10, 10, 5043, 4, 11, 11, 1021, 7043