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: ['c', 'm', '1515', 'q', 'V', 'Q', '9909', 'o', '9447', '885', 'P', 'k', 'M', 'J']

3, 13, 1515, 17, 22, 17, 9909, 15, 9447, 885, 16, 11, 13, 10