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: ['G', 'I', 'A', '6405', 'I', 'X', '6817', 'L', '7637', 'm', 'F', 'u', '8179', 'p', 'a', 'n', 'A', '5429', '615', '5131', '9103', '3743', 's', 'n', 'X', 'd', '4441', '6621', '3369', '2963', '1383']

7, 9, 1, 6405, 9, 24, 6817, 12, 7637, 13, 6, 21, 8179, 16, 1, 14, 1, 5429, 615, 5131, 9103, 3743, 19, 14, 24, 4, 4441, 6621, 3369, 2963, 1383