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', 'o', 'b', 'b', '889', '8727', 'U', '7667', 'b', 'F', 'l', '1537', 'R', '179', 't', '7013', '199']

15, 15, 2, 2, 889, 8727, 21, 7667, 2, 6, 12, 1537, 18, 179, 20, 7013, 199