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: ['A', 'W', '6129', 'I', '6683', 'w', '431', '7859', '5141', '1207', '8949', 'e', '1509', 'i', '99', '5565', '8829', 'R', 'C', '9529', 'k', '8659', '5901', 'd', '1927', '7981', '5675', 'N', '2019', '8999', 'R', '3905', 'k', '1301', '6077', 'S']

1, 23, 6129, 9, 6683, 23, 431, 7859, 5141, 1207, 8949, 5, 1509, 9, 99, 5565, 8829, 18, 3, 9529, 11, 8659, 5901, 4, 1927, 7981, 5675, 14, 2019, 8999, 18, 3905, 11, 1301, 6077, 19