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', '5257', 'c', '1923', 'R', 'T', '3083', 'i', 'd', 'B', '7757', 'F', 't', '6947', 'v', '9483', 'M', '4869', '4237', 'm', 'h', 'l', '8635', 'N', '9701', 'H', '8371', 'G', '2217', '841', '809', 'H', '1117']

3, 5257, 3, 1923, 18, 20, 3083, 9, 4, 2, 7757, 6, 20, 6947, 22, 9483, 13, 4869, 4237, 13, 8, 12, 8635, 14, 9701, 8, 8371, 7, 2217, 841, 809, 8, 1117