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: ['h', '4057', '6831', 'r', 'u', '6657', '1855', '8691', '4841', 'x', '3941', 'Y', 'i', '4777', 'z', '5287']

8, 4057, 6831, 18, 21, 6657, 1855, 8691, 4841, 24, 3941, 25, 9, 4777, 26, 5287