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: ['x', '3955', '6245', 'A', '2923', '7425', '9869', 't', 'n', 'Q', 's', '1537', 'c']

24, 3955, 6245, 1, 2923, 7425, 9869, 20, 14, 17, 19, 1537, 3