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: ['1263', '5559', 'V', '5153', 'j', 'b', '8087', '4799', '9947', 'J', 'Z', '8133', '6445', '2133', '9683', 'Z', 'T', '6961', 'T', '9557']

1263, 5559, 22, 5153, 10, 2, 8087, 4799, 9947, 10, 26, 8133, 6445, 2133, 9683, 26, 20, 6961, 20, 9557