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: ['3111', 'S', 'w', '2713', 'a', 'M', 'T', '6715', 'Y', '5855', 'Y', '5879', '7529', '5137', 'P', 'W']

3111, 19, 23, 2713, 1, 13, 20, 6715, 25, 5855, 25, 5879, 7529, 5137, 16, 23