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: ['7779', 'R', 'A', '1857', '4081', 'n', 'Y', 'W', '6485', 'N', '6261']

7779, 18, 1, 1857, 4081, 14, 25, 23, 6485, 14, 6261