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: ['9957', 'j', 'g', '2425', 'o', 'i', '3907', '5613', 'b', '8739', 'l', '2227', 'n', '6311', '2659', '5967']

9957, 10, 7, 2425, 15, 9, 3907, 5613, 2, 8739, 12, 2227, 14, 6311, 2659, 5967