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: ['O', '8847', '359', '1729', '1287', '1293', '1089', '449', '8543', 'e', '5201', 'v', 'h', 'y', 'N', '7863', '5041', 'y', 'D', '89', '4627', 'k', 'g', 'K', '2509', '8329', 'y', 'L', '7545', 'I', 'c', '7307']

15, 8847, 359, 1729, 1287, 1293, 1089, 449, 8543, 5, 5201, 22, 8, 25, 14, 7863, 5041, 25, 4, 89, 4627, 11, 7, 11, 2509, 8329, 25, 12, 7545, 9, 3, 7307