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: ['983', '1287', 'G', 'w', '7903', 'x', '1', '6421', '6861']

983, 1287, 7, 23, 7903, 24, 1, 6421, 6861