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', 's', 'K', 'l', '3897', 'H', 'p', '4725', 'k', 'y', '6457', 'o', 'V']

26, 19, 11, 12, 3897, 8, 16, 4725, 11, 25, 6457, 15, 22