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: ['929', 'R', '4371', '7125', '2137', 'Z', 'J', 'x', 'q', '781', 'B', '5343', '8381', '7845', 'O', 'J', 'E', 'e', '4469', 'A', '3191', '2689', 'u']

929, 18, 4371, 7125, 2137, 26, 10, 24, 17, 781, 2, 5343, 8381, 7845, 15, 10, 5, 5, 4469, 1, 3191, 2689, 21