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: ['5643', 'Z', 'f', '6819', 'v', 'R', 'r', 'd', 'm', 'c', 'Z', '8915', 'q', '1993', 'U', '1467', 'K', 'm', '5919', '8191', '4049', '1893', '109', '1313', 'g', 'l', '5885', 'a', '1877', '3595', '7645', '1781', '2927', 'Z', '5705', '8053', 'Z', 'l', 'P', '5127']

5643, 26, 6, 6819, 22, 18, 18, 4, 13, 3, 26, 8915, 17, 1993, 21, 1467, 11, 13, 5919, 8191, 4049, 1893, 109, 1313, 7, 12, 5885, 1, 1877, 3595, 7645, 1781, 2927, 26, 5705, 8053, 26, 12, 16, 5127