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: ['1791', '7831', 'D', 'V', 's', '353', '6003', '8555', '3329', 'Y', 'L', 'm', '7241', '9263', '5079']

1791, 7831, 4, 22, 19, 353, 6003, 8555, 3329, 25, 12, 13, 7241, 9263, 5079