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', 'F', 'c', '9269', '3261', 'r', 'Y', 'd', '4235', '4535']

14, 6, 3, 9269, 3261, 18, 25, 4, 4235, 4535