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: ['5041', 'O', 'F', '9911', '789', 'w', 'j', '8555', '2033', 'I', 'W', '9459', 'V', '1391', '8245']

5041, 15, 6, 9911, 789, 23, 10, 8555, 2033, 9, 23, 9459, 22, 1391, 8245