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: ['N', '5983', 's', 'D', 'm', 'P', '8385', 'Z', '9903', 'f', '7649', '2181', '5189', '4757', 'p', '1139', '5429', 'e', '2023', '7431']

14, 5983, 19, 4, 13, 16, 8385, 26, 9903, 6, 7649, 2181, 5189, 4757, 16, 1139, 5429, 5, 2023, 7431