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: ['587', '1657', 'C', '509', '41', '3609', 's', '9825', '625', 'Z', '1215', 'P', 'v', 'm', '7199', '1727', 'j', '4699', 'z', 'Q', 'y', 'f', '8837', '7505', 'y', '9777', '5063', '6393', '5591', '8495', '8797', '6101', 'h', '6083', '4209', '6765']

587, 1657, 3, 509, 41, 3609, 19, 9825, 625, 26, 1215, 16, 22, 13, 7199, 1727, 10, 4699, 26, 17, 25, 6, 8837, 7505, 25, 9777, 5063, 6393, 5591, 8495, 8797, 6101, 8, 6083, 4209, 6765