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: ['W', 'I', 'w', 'I', 'C', 'm', '7495', 'h', 'O', '6659', 'X', 'H', 'n', '7829']

23, 9, 23, 9, 3, 13, 7495, 8, 15, 6659, 24, 8, 14, 7829