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: ['3413', '2571', 'i', '4103', '9159', '9415', '7799', '1389', '9603', 'N', 'v', '6287', 'N', 'O', 'B', '6573', '7845', '5377']

3413, 2571, 9, 4103, 9159, 9415, 7799, 1389, 9603, 14, 22, 6287, 14, 15, 2, 6573, 7845, 5377