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: ['a', 'u', 'K', 'B', 'o', 'e', '2343', 'S', 'M', 'U', '1245', '373', 'w', '3619', '415', '8737', 'z', '5851', '7821', 'E', 'x', '3839', 'c', 'L', '7387', 'A', '227', '3085', 'j', '6879', '6909', 'l', '3359']

1, 21, 11, 2, 15, 5, 2343, 19, 13, 21, 1245, 373, 23, 3619, 415, 8737, 26, 5851, 7821, 5, 24, 3839, 3, 12, 7387, 1, 227, 3085, 10, 6879, 6909, 12, 3359