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: ['s', 's', 'o', 'q', 'W', '1937', '5223', 'H', '7337', '551', 'i', 'm', '5213']

19, 19, 15, 17, 23, 1937, 5223, 8, 7337, 551, 9, 13, 5213