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: ['3295', 'c', '3743', '209', '1791', 'R', '4259', '4113', '3347', 'u', '723', '9615', '3825']

3295, 3, 3743, 209, 1791, 18, 4259, 4113, 3347, 21, 723, 9615, 3825