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: ['c', '2917', 'T', 'a', '5497', 'f', 'd', '6279', 'b', 'X', 'h', '9955', '5689', '1009', 'Z', '2439']

3, 2917, 20, 1, 5497, 6, 4, 6279, 2, 24, 8, 9955, 5689, 1009, 26, 2439