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', 'x', 'R', '3415', 'O', '8573', 'i', 'h', '3511', '4955', 'K', 'i', '4655', 'N']

8, 24, 18, 3415, 15, 8573, 9, 8, 3511, 4955, 11, 9, 4655, 14