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: ['q', '5383', 'x', 'P', '6447', 'z', 'c', 'X', 'Q', '4937', 'M', '8859', 'B', '4061', 'Z', '5693', 'z', '2729', '3721', '3539', 'x', 'a', 'B', '5357']

17, 5383, 24, 16, 6447, 26, 3, 24, 17, 4937, 13, 8859, 2, 4061, 26, 5693, 26, 2729, 3721, 3539, 24, 1, 2, 5357