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: ['c', '6131', '2223', '239', '469', 'L', '4973', '413', '5789', 's', 'a', '6067']

3, 6131, 2223, 239, 469, 12, 4973, 413, 5789, 19, 1, 6067