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: ['f', 'B', '1337', 'k', 'B', '3435', 'I', 'V', '5629', '6979', '6309', '6345', 'p', 'f', 'H', 'G', '9313', '5993', 'l', 'D', 'L', '3519', 't', '725', '1969', 'X', 'Y', '2325', 'Q', '8077', '8753', '587', '9803', '9185', '3401', '6927', '2201', '5793']

6, 2, 1337, 11, 2, 3435, 9, 22, 5629, 6979, 6309, 6345, 16, 6, 8, 7, 9313, 5993, 12, 4, 12, 3519, 20, 725, 1969, 24, 25, 2325, 17, 8077, 8753, 587, 9803, 9185, 3401, 6927, 2201, 5793