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: ['Z', 'B', 'F', 'E', '9941', '617', 'x', 'z', '3075', 'X', 'o', '9071', 'W', '2729', '7869', 'U', 'Y']

26, 2, 6, 5, 9941, 617, 24, 26, 3075, 24, 15, 9071, 23, 2729, 7869, 21, 25