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: ['867', 'F', 'r', '5121', '5419', '7875', '2177', '8857', 'N', '4457', 'N', '8909', 'm', '1047', '5715', '3275', 'B', 'P', '4497', '2815', 'V', 'z', '5081', '1995', '8583', 'H', '6117', '5767', '1707']

867, 6, 18, 5121, 5419, 7875, 2177, 8857, 14, 4457, 14, 8909, 13, 1047, 5715, 3275, 2, 16, 4497, 2815, 22, 26, 5081, 1995, 8583, 8, 6117, 5767, 1707