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: ['A', 'o', '1447', 's', '3391', '3093', '4979', 'x', 'A']

1, 15, 1447, 19, 3391, 3093, 4979, 24, 1