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: ['2413', '11', '2035', '7573', '4335', 'O', '6947', 'J']

2413, 11, 2035, 7573, 4335, 15, 6947, 10