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: ['F', '8853', 'C', 'd', '65', 'k', 'U', '1113', 'x', '3867', '4615', 'K', '4677']

6, 8853, 3, 4, 65, 11, 21, 1113, 24, 3867, 4615, 11, 4677