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: ['35', '1281', '573', '6817', '261', '9977', 'd', '4485', 'a', '3527', 'P', 'I', '7543', 'g', 'O', 'S', 'P']

35, 1281, 573, 6817, 261, 9977, 4, 4485, 1, 3527, 16, 9, 7543, 7, 15, 19, 16