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: ['l', '1151', '2831', 'N', 'w', '8129', '2881', 'H', 'Y', '5153', '2851', '5101', 'a', '8005', 'Y', '8503', 'T', '203', 'I', 'K', '6775', 'B', 'T', 'Z', 'h', '8139', 'p']

12, 1151, 2831, 14, 23, 8129, 2881, 8, 25, 5153, 2851, 5101, 1, 8005, 25, 8503, 20, 203, 9, 11, 6775, 2, 20, 26, 8, 8139, 16