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: ['1209', '2179', '6245', 't', '5993', '8953', 't', 'i', '6777', '9925', 'd', 'I', '4119', 'm', '173', '961', 'F', '4597', 'h', '5599', 'L', '163', '1111', 'N', '1931', 'c', '8145', '2039', '4693', '3407']

1209, 2179, 6245, 20, 5993, 8953, 20, 9, 6777, 9925, 4, 9, 4119, 13, 173, 961, 6, 4597, 8, 5599, 12, 163, 1111, 14, 1931, 3, 8145, 2039, 4693, 3407