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: ['U', '5461', '2927', '5929', '3397', '6503', 'e', '577', '1959', 'o', 'H', 'W', 'i', 'i', '8989', '5779', '5313', 's', '3353', 'y', '3777', '7049', '3233', '7597', 'r', 'r', 'm', 'q', '4849', '543', '3325', '9841', '9249', 'T', 'i', '8121', '325', '7973']

21, 5461, 2927, 5929, 3397, 6503, 5, 577, 1959, 15, 8, 23, 9, 9, 8989, 5779, 5313, 19, 3353, 25, 3777, 7049, 3233, 7597, 18, 18, 13, 17, 4849, 543, 3325, 9841, 9249, 20, 9, 8121, 325, 7973