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', '7475', 'Q', 'v', '9739', '9691', 'I', 'U']

22, 7475, 17, 22, 9739, 9691, 9, 21