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', '1509', 'F', '8227', '1999', 'Y', 'g', 'Z', '6299', '7369', 'L', '3999', 'r', '1719', 'k', '1303', '9499', '4561', 'G', 'd', '2955', '839', '1983', '4635', 't', 'g', '1205', '2983', '3535', 'j', '4041']

2, 1509, 6, 8227, 1999, 25, 7, 26, 6299, 7369, 12, 3999, 18, 1719, 11, 1303, 9499, 4561, 7, 4, 2955, 839, 1983, 4635, 20, 7, 1205, 2983, 3535, 10, 4041