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: ['I', '6141', '8617', '5499', '4475', 'H', '9065', '4173', 'z', 'C', '6515', '613', 'r', 'j', '579', '5613', 'I', 'A', '9393', '6785', 'y', '1905', '5587', 's', 'I', '5197', '8121', '2471', 'I', 'f', '5055', '1309', 'G', '7235', '6439']

9, 6141, 8617, 5499, 4475, 8, 9065, 4173, 26, 3, 6515, 613, 18, 10, 579, 5613, 9, 1, 9393, 6785, 25, 1905, 5587, 19, 9, 5197, 8121, 2471, 9, 6, 5055, 1309, 7, 7235, 6439