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: ['9945', 'O', 'X', 'l', '357', 'L', '8713', '9441', '1461', '351', '5929', 'o', '5539', '5431', 'j', '2109', 'r', '29', '6537', '197']

9945, 15, 24, 12, 357, 12, 8713, 9441, 1461, 351, 5929, 15, 5539, 5431, 10, 2109, 18, 29, 6537, 197