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: ['h', 'O', 'W', 'x', '1839', '5851', 'R', 'e', '4439', '6841', '1523', '2185', '3567', 'A', '5895', 'K', 'j', '1693', '9377', 'F', 'K', '291', 'a', '1577', '7871', 'I']

8, 15, 23, 24, 1839, 5851, 18, 5, 4439, 6841, 1523, 2185, 3567, 1, 5895, 11, 10, 1693, 9377, 6, 11, 291, 1, 1577, 7871, 9