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: ['5295', 'X', 'D', 'I', '6023', 'n', '5813', 'P', 'V', 's', 'k', 'B', '143', 'c', 'K', 'K']

5295, 24, 4, 9, 6023, 14, 5813, 16, 22, 19, 11, 2, 143, 3, 11, 11