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: ['t', 'u', 'H', 'y', 'A', 't', 'G', '3361', '8209', 'V', '4765']

20, 21, 8, 25, 1, 20, 7, 3361, 8209, 22, 4765