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: ['2703', '8453', '2485', '849', '6781', '8315', 'T', '4261', '9831', 'j', 'u', '1259', 'O', 'l', '8981', '5515', 'W', '7193', 'l', 'O', '7821', 'a', 'g', 'q', 's', 'l', 'R', 'K', '835', 'N', 'j']

2703, 8453, 2485, 849, 6781, 8315, 20, 4261, 9831, 10, 21, 1259, 15, 12, 8981, 5515, 23, 7193, 12, 15, 7821, 1, 7, 17, 19, 12, 18, 11, 835, 14, 10