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: ['E', 'C', 'I', 'G', '5451', 'K', '4777', 'u', '3735', 'q', '3809', '3029', 'N', 'u', 'G', 'v', '1659', 'l', 'B', '5801', 'Y', '8183', 'c', '5927', '9703', '2507', '5907', '6725', 'z', '7047', '6885', 'I', 'F']

5, 3, 9, 7, 5451, 11, 4777, 21, 3735, 17, 3809, 3029, 14, 21, 7, 22, 1659, 12, 2, 5801, 25, 8183, 3, 5927, 9703, 2507, 5907, 6725, 26, 7047, 6885, 9, 6