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: ['7475', 't', 'J', '327', 'l', '8101', 'w', 'G', 'm', '3727', 'M', '9195', '1691', '539']

7475, 20, 10, 327, 12, 8101, 23, 7, 13, 3727, 13, 9195, 1691, 539