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: ['5259', '973', 'N', 'f', 'w', 'L', 'o', 'z', '5169', 't', 'd', 'e', '2691', 'k', '8065', '2265', 'o', 'B', '7581', '5195', '6951', 'G', '7447', '6499', '1907', '281']

5259, 973, 14, 6, 23, 12, 15, 26, 5169, 20, 4, 5, 2691, 11, 8065, 2265, 15, 2, 7581, 5195, 6951, 7, 7447, 6499, 1907, 281