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: ['N', '6263', '4187', 'P', 'w', '69', '1411', 'A', 't', '9409', 'B', 'c', 'C', 'l', 'c', '1775', 'K', '2743', '6513', 'x', 'O', '6875', 'c']

14, 6263, 4187, 16, 23, 69, 1411, 1, 20, 9409, 2, 3, 3, 12, 3, 1775, 11, 2743, 6513, 24, 15, 6875, 3