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', '2113', 'd', '2789', '1879', 'k', '1619', '5379', 'U', '1283', 'N']

3, 2113, 4, 2789, 1879, 11, 1619, 5379, 21, 1283, 14