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', 'S', '4931', 'y', 'c', 'V', '5841', '6503', 'w', '8007', 'H', 'c', '6371', 'L']

2, 19, 4931, 25, 3, 22, 5841, 6503, 23, 8007, 8, 3, 6371, 12