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', 'g', '3915', 'M', 'P', '2391', 'u', 'h', 'a', '207', '2263', '3889', '563', 'e', '3207', '4931', '5407', 'g', 'j', 's', 'p', '2131', '8019', '1713', 'Z', 'A', '3741', 'x']

21, 7, 3915, 13, 16, 2391, 21, 8, 1, 207, 2263, 3889, 563, 5, 3207, 4931, 5407, 7, 10, 19, 16, 2131, 8019, 1713, 26, 1, 3741, 24