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', 't', '7571', '7625', '4695', '2369', '1101', 'Y', '2993', '357', 'P', '9479', '5339', '6409', '3609', '6819', 'E', 'a', '4711', '7415', '4477', 'N', '6447', 'x', '5221']

15, 20, 7571, 7625, 4695, 2369, 1101, 25, 2993, 357, 16, 9479, 5339, 6409, 3609, 6819, 5, 1, 4711, 7415, 4477, 14, 6447, 24, 5221