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: ['7807', 'j', '159', '7817', 'k', 'C', 'l', '1619', 'L', '8023', 'J', '873', 'K', '1693', 'I', '7181', '225']

7807, 10, 159, 7817, 11, 3, 12, 1619, 12, 8023, 10, 873, 11, 1693, 9, 7181, 225