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: ['o', '5987', '9215', '805', '4733', 's', '7797', 'w', 'o', 'k', 'l', 'I', 'u', 'y', '6955', '3133', '3851', 'M', 'F', '3019', 'h', 'w', 'R', '5469', 'M', '479', '8431', '1651', 'a', '6295', '107', 'W', '6365', 'P', '889', 'J', 'Y', 'T', 'Z']

15, 5987, 9215, 805, 4733, 19, 7797, 23, 15, 11, 12, 9, 21, 25, 6955, 3133, 3851, 13, 6, 3019, 8, 23, 18, 5469, 13, 479, 8431, 1651, 1, 6295, 107, 23, 6365, 16, 889, 10, 25, 20, 26