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: ['Z', 'm', 'R', '3333', '8887', '6049', 'U', 'P', 'K', 'A', '4285', '3365', 'c', '8737', 'J']

26, 13, 18, 3333, 8887, 6049, 21, 16, 11, 1, 4285, 3365, 3, 8737, 10