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: ['b', '7621', '8621', 'p', 'O', '1961', '9275', 'F', 'T', 'w', '9143', 'T', '9715', 'K', '237', 'o', '1183', '1163', 'O', '1803', 'u', 'W', 'd', 'E', 'c', 'z', '8349', '1673', '1915', '1497', 'g', 'D', '9995', '3891', '2029', '8911', 'b', '7891', '1757', 'r']

2, 7621, 8621, 16, 15, 1961, 9275, 6, 20, 23, 9143, 20, 9715, 11, 237, 15, 1183, 1163, 15, 1803, 21, 23, 4, 5, 3, 26, 8349, 1673, 1915, 1497, 7, 4, 9995, 3891, 2029, 8911, 2, 7891, 1757, 18