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: ['U', 'Z', 'L', 'l', 'Y', 'E', 'P', 't', 'z', 'v', '3811', 'O', '4781', '7303', '5329', '4589', 's', 'e', 'Z', 'b', '2741', '7231', '3145', 'c', '2713', '275', 'o', '6425', '8903', '2045', '5599', 'G']

21, 26, 12, 12, 25, 5, 16, 20, 26, 22, 3811, 15, 4781, 7303, 5329, 4589, 19, 5, 26, 2, 2741, 7231, 3145, 3, 2713, 275, 15, 6425, 8903, 2045, 5599, 7