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: ['C', '7421', '1889', '2359', '8335', '1135', 'h', '1701', '7417', 'i', 'v', 'i', 'q', 'T', '5097', '1247', '341', '6273', 'c', '599', 'R', '2769', '3641', 'K', 'y', '1767', 'P', 'q', '2403', 'E']

3, 7421, 1889, 2359, 8335, 1135, 8, 1701, 7417, 9, 22, 9, 17, 20, 5097, 1247, 341, 6273, 3, 599, 18, 2769, 3641, 11, 25, 1767, 16, 17, 2403, 5