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: ['f', '3015', '6773', 'l', '489', 'z', 'V', 'b', 'd', '3947', 'y', '4025', '9753', 'k', '1447', '8827', '5827', '9835', 'k', '3223', '9859', '9847', 'r', '3263', '5059', 'L', 'u', 'u', 'X', 'M', '9159']

6, 3015, 6773, 12, 489, 26, 22, 2, 4, 3947, 25, 4025, 9753, 11, 1447, 8827, 5827, 9835, 11, 3223, 9859, 9847, 18, 3263, 5059, 12, 21, 21, 24, 13, 9159