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: ['W', 't', '7283', 'T', '1773', 'n', 'v', '1743', 'V', 'z', 'I']

23, 20, 7283, 20, 1773, 14, 22, 1743, 22, 26, 9