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: ['n', 'G', '4759', '2613', '6897', '6777', 'J', 'd', 'Y', '1181', '6087', '1187']

14, 7, 4759, 2613, 6897, 6777, 10, 4, 25, 1181, 6087, 1187