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: ['B', '5851', '2919', 'G', '809', '2305', '7467', 'i', 'V', '4913', 'K', 'L', 'T', '2979', '6017', 'W', '5597', '1317', 'r', 'b', '1805', 'u', '1407', '3629', 'x']

2, 5851, 2919, 7, 809, 2305, 7467, 9, 22, 4913, 11, 12, 20, 2979, 6017, 23, 5597, 1317, 18, 2, 1805, 21, 1407, 3629, 24