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: ['2493', 'u', 'R', 'v', '4657', 'c', '3483', 'S']

2493, 21, 18, 22, 4657, 3, 3483, 19