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: ['5523', 'r', 't', '1839', 's', '1441', 'C', 'W', '4709', '5217', 'p', 'O', 't', '2919', 'q', '1215', 'D', '4763', 'J', 'H', '5143', 'r', '9065', '8519', '253', '61', '4377']

5523, 18, 20, 1839, 19, 1441, 3, 23, 4709, 5217, 16, 15, 20, 2919, 17, 1215, 4, 4763, 10, 8, 5143, 18, 9065, 8519, 253, 61, 4377