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: ['u', 'd', 'D', '6785', 'c', 'J', 'Q', '7197', '3243', '8363', 'e', 'u', '1507', 'x', 'R', '429', '193', '5841', 'X', 'x', '2723', 'V', 'K']

21, 4, 4, 6785, 3, 10, 17, 7197, 3243, 8363, 5, 21, 1507, 24, 18, 429, 193, 5841, 24, 24, 2723, 22, 11