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: ['5871', '4691', 'O', 'K', '4583', '6691', 'V', 'j', 'L', 'r', '5049', 'A', '5183', '589', 'K', 'm', '3121', '6313', 'P', '6295', '9421', '6293', 'g', 'w', 'l']

5871, 4691, 15, 11, 4583, 6691, 22, 10, 12, 18, 5049, 1, 5183, 589, 11, 13, 3121, 6313, 16, 6295, 9421, 6293, 7, 23, 12