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', 'R', '5105', '6845', 'D', 'K', '8205', 'A', '6387', '6137', '7405', '3605', '1805', 'x', 'Q', '311', '8481']

8, 18, 5105, 6845, 4, 11, 8205, 1, 6387, 6137, 7405, 3605, 1805, 24, 17, 311, 8481