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: ['3803', '3289', '9059', '8243', '3643', 'p', 't', '2709', '6585', 'f', 'p', 'm', 'Z']

3803, 3289, 9059, 8243, 3643, 16, 20, 2709, 6585, 6, 16, 13, 26