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: ['3209', 'Q', '6931', 'N', 'o', '7587', 'i', '3781', '9103', '1965', 'r', 'Z', 'Q', '6869', '6713', 'F']

3209, 17, 6931, 14, 15, 7587, 9, 3781, 9103, 1965, 18, 26, 17, 6869, 6713, 6