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: ['2943', 'W', '9215', '7335', 'h', 'P', 'v', 'C', '1057', 'U', '5869', 'P', '6261', '2687', 'x', 'A', '2515', '9833', 'm', '6199', '8907', '3219', 'M', 'I', '8249', '4177', 'y', 'k', 'j', 'o', '6243', 'R', '499']

2943, 23, 9215, 7335, 8, 16, 22, 3, 1057, 21, 5869, 16, 6261, 2687, 24, 1, 2515, 9833, 13, 6199, 8907, 3219, 13, 9, 8249, 4177, 25, 11, 10, 15, 6243, 18, 499