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: ['H', 'J', '1091', '6811', 'A', 'n', '9233', '8739', '6573', 'X', '8597', '8297', '7251', '1683', 'W', '5831', 'x', '805', 'j', 'W', 'n', 'P', 'f', '6779', 'q', '2599', 'Z', '1453', 'T', '2411', '8991', '3073', 'k', 'm', '4139', 'n', 'C', '6899', 'L']

8, 10, 1091, 6811, 1, 14, 9233, 8739, 6573, 24, 8597, 8297, 7251, 1683, 23, 5831, 24, 805, 10, 23, 14, 16, 6, 6779, 17, 2599, 26, 1453, 20, 2411, 8991, 3073, 11, 13, 4139, 14, 3, 6899, 12