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: ['477', 'l', '5313', '7803', '8587', '5905', 'U', 'W', '5743', 'P', '5639', 'A', 'C', '5223', '3241', '4793', '2985', '1637', 'k', 'B', '9135', 'e', '9843', '255', '1947', 'u', '485', '8761', '713', 'e', 'D', '789', '9091']

477, 12, 5313, 7803, 8587, 5905, 21, 23, 5743, 16, 5639, 1, 3, 5223, 3241, 4793, 2985, 1637, 11, 2, 9135, 5, 9843, 255, 1947, 21, 485, 8761, 713, 5, 4, 789, 9091