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: ['Y', 'd', '4203', '5117', 'a', '5219', 'M', '1553', '4225', 'p', 'n', 'S', '3427', 't', 'w', '9067', 'Y', '6903', 'T', 'D', 'm', 'H', 'U', '9923', '5089', '9669', '8227', 'u', 'q', '4721']

25, 4, 4203, 5117, 1, 5219, 13, 1553, 4225, 16, 14, 19, 3427, 20, 23, 9067, 25, 6903, 20, 4, 13, 8, 21, 9923, 5089, 9669, 8227, 21, 17, 4721