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: ['V', 't', '5519', '6271', '9239', 'Q', 'z', '9645', 'I', '6699']

22, 20, 5519, 6271, 9239, 17, 26, 9645, 9, 6699