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: ['6325', '3459', '8583', '9463', 't', '9003', '4071', 'V', '4181', '7475', 'w', '8299', 'K', 'F', 'U', 'D', 'L', 'S']

6325, 3459, 8583, 9463, 20, 9003, 4071, 22, 4181, 7475, 23, 8299, 11, 6, 21, 4, 12, 19