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: ['669', 'q', 'p', '6257', '3865', 'p', '6179', '6787', '9651', '1209', '7265', 'X', 'K', 'S', '1269', 'A', 'c', 'n', 'i', 'F']

669, 17, 16, 6257, 3865, 16, 6179, 6787, 9651, 1209, 7265, 24, 11, 19, 1269, 1, 3, 14, 9, 6