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: ['3445', 'g', '8599', '9745', 'o', 'v', '6981', 'S', '4823', 'C', 'y', 'N', 'B', '789', 'k', 'X', 'D']

3445, 7, 8599, 9745, 15, 22, 6981, 19, 4823, 3, 25, 14, 2, 789, 11, 24, 4