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', '1643', 'C', 'r', 'd', 'G', '8203', 'G', '2723', 'w', 'r', 'o', '7439', 'R', '9061', 'g', '5309', '1923', 'x', 'g', 'l', '6099', '4467', 'g', 'r', '1859', 'i', '4203', 'D', 'e', '2239', '5633', '301', 'C', 'e', '9915', 'q', '8967', '2439', 'h']

12, 1643, 3, 18, 4, 7, 8203, 7, 2723, 23, 18, 15, 7439, 18, 9061, 7, 5309, 1923, 24, 7, 12, 6099, 4467, 7, 18, 1859, 9, 4203, 4, 5, 2239, 5633, 301, 3, 5, 9915, 17, 8967, 2439, 8