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: ['C', '4221', '3325', 'x', '4145', '7675', 'C', '2491', '7163', '7101', 'J', '5003', '953', 'E', '1543', 'M', 'f', 'M', '5071', 'c', 'B', '2291', '4863', '2113', '3725', '3467', '7247', '1635', '2139', 'N', '735', '5087', '5839', 'j', 'i']

3, 4221, 3325, 24, 4145, 7675, 3, 2491, 7163, 7101, 10, 5003, 953, 5, 1543, 13, 6, 13, 5071, 3, 2, 2291, 4863, 2113, 3725, 3467, 7247, 1635, 2139, 14, 735, 5087, 5839, 10, 9