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: ['1747', 'M', 'O', 'D', '81', 'X', '1551', 'K', '2245', 'g', '9771', '5771', 'C', 'I', 'L', '7825', 'n', 'X', 'O', '1997', 'l', '4745', '7377', 'n', 'j', '909', '6257', 'D', '5219', '3711', '147', '4895', '1843', '4531', 'c', 'g', '4089', '2179', '3357', '5821']

1747, 13, 15, 4, 81, 24, 1551, 11, 2245, 7, 9771, 5771, 3, 9, 12, 7825, 14, 24, 15, 1997, 12, 4745, 7377, 14, 10, 909, 6257, 4, 5219, 3711, 147, 4895, 1843, 4531, 3, 7, 4089, 2179, 3357, 5821