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: ['2769', '859', 'Y', '5149', '5729', '5717', '9233', '3819', 'u', '2379', 'E', 'w', '11', '9545', '6425', '2533', '5637', '1969', 'S']

2769, 859, 25, 5149, 5729, 5717, 9233, 3819, 21, 2379, 5, 23, 11, 9545, 6425, 2533, 5637, 1969, 19