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: ['7629', 'O', 'N', 'f', 'f', '5963', 'Q', 't', '9039', '2063', '4063', 'j', 'p', '8701', 'e', '8453', 'g', '3469', '6215', '1275', '2589', 'l', '2047', '2743', 'O', 'E']

7629, 15, 14, 6, 6, 5963, 17, 20, 9039, 2063, 4063, 10, 16, 8701, 5, 8453, 7, 3469, 6215, 1275, 2589, 12, 2047, 2743, 15, 5