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: ['T', 'l', 'l', '123', 'Z', '6103', 'C', '4451', '8477', '289', '8075', 'Q', '3163', '5865', '6697', '5489', 'e', 't', '8641', 'Q', 'T', '4867', '3881', '3811', 'r', '4149', '6837', '9513', '4841', '1441', 'k', 'U', 'Y']

20, 12, 12, 123, 26, 6103, 3, 4451, 8477, 289, 8075, 17, 3163, 5865, 6697, 5489, 5, 20, 8641, 17, 20, 4867, 3881, 3811, 18, 4149, 6837, 9513, 4841, 1441, 11, 21, 25