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: ['2191', 'j', '735', '7613', '6563', '3465', '2629', 'Y', 'F', 'q', '6549', 'b', 'C', 'R', '6861', 'y', '7147', '1547', '2313', '9361', 'y', 'u', 's']

2191, 10, 735, 7613, 6563, 3465, 2629, 25, 6, 17, 6549, 2, 3, 18, 6861, 25, 7147, 1547, 2313, 9361, 25, 21, 19