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: ['9139', 'e', 'Y', 'V', '139', '4375', '4629', 'x', '3625', '1065', 'n', '8487', '841', 'Y', '6025', '6737', '757', 'Z', '4179', 'H', 'y', '8293', 's', '3499', '2383', 'h', 'U', 'o', 'a']

9139, 5, 25, 22, 139, 4375, 4629, 24, 3625, 1065, 14, 8487, 841, 25, 6025, 6737, 757, 26, 4179, 8, 25, 8293, 19, 3499, 2383, 8, 21, 15, 1