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: ['t', '4179', 'O', '1271', 'v', 'd', '3901', 'x', 'z', '6427', '2349', '391', '705', '4225', '5879', '853', '8453', '1183', '4229', 'Z', '5015', 'M', 'D', 'v', '5099', 'k', 'F', 'F', 'V', '7505', 'M']

20, 4179, 15, 1271, 22, 4, 3901, 24, 26, 6427, 2349, 391, 705, 4225, 5879, 853, 8453, 1183, 4229, 26, 5015, 13, 4, 22, 5099, 11, 6, 6, 22, 7505, 13