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: ['7577', '1215', 'W', '1099', 'I', 'F', '833', '3861', 'V', 'n', 'd', '7215', 'S', 'o', 'U', 'n', 'Z', '6301', 'U', '6043', '4189', 'U', 't', '5185', 'f']

7577, 1215, 23, 1099, 9, 6, 833, 3861, 22, 14, 4, 7215, 19, 15, 21, 14, 26, 6301, 21, 6043, 4189, 21, 20, 5185, 6