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: ['9507', '8099', 'v', '1935', '637', 'S', 'l', 'z', 'G', 'n', '8967', '2281', '4245', 'Q', '485', 'v', 'B', 'O', 'O', '4653', '2921', 'v']

9507, 8099, 22, 1935, 637, 19, 12, 26, 7, 14, 8967, 2281, 4245, 17, 485, 22, 2, 15, 15, 4653, 2921, 22