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: ['5757', '8479', '3339', '6737', '3551', 'H', '7943', 'a', 'l', 'S', 'Z', 'S', '8461', 'i', '6739', 'n', 'v', 'X', '597', '8847', '1187', '4043', '8935', '711', 'U', 'e', '4063']

5757, 8479, 3339, 6737, 3551, 8, 7943, 1, 12, 19, 26, 19, 8461, 9, 6739, 14, 22, 24, 597, 8847, 1187, 4043, 8935, 711, 21, 5, 4063