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: ['F', '303', '4707', '6701', '2629', 'M', '4985', '9847', '2467', 'H', 'W', 'y', 'D', 'T', 'f', 'Y', 'v', '755', '509', 'D', '7265', 'e', '697', '1923', '5291', 'R', 'd', 's', 'V', '5811', '3657']

6, 303, 4707, 6701, 2629, 13, 4985, 9847, 2467, 8, 23, 25, 4, 20, 6, 25, 22, 755, 509, 4, 7265, 5, 697, 1923, 5291, 18, 4, 19, 22, 5811, 3657