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: ['3565', 'a', 'S', '1891', 'A', '1853', 'h', 'a', 'w', 'p', '855', '7999', 'a', 'w', '3371', '887', '9065', 'u']

3565, 1, 19, 1891, 1, 1853, 8, 1, 23, 16, 855, 7999, 1, 23, 3371, 887, 9065, 21