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: ['6021', '7445', 'v', '2639', 'D', 'f', 'z', '4017', 'n', '61', '7009', 's', '5069', 'E', '8531', '6363', 'u']

6021, 7445, 22, 2639, 4, 6, 26, 4017, 14, 61, 7009, 19, 5069, 5, 8531, 6363, 21