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: ['8217', 'Q', '7627', 'c', 'e', 'R', 'U', '3601', '307', 'M', 'k', '9891', 'e', '7893', 'j', '9117', 'd', 'U', '2121', '795', '3719', '4311', 'Z', 'b', '4969']

8217, 17, 7627, 3, 5, 18, 21, 3601, 307, 13, 11, 9891, 5, 7893, 10, 9117, 4, 21, 2121, 795, 3719, 4311, 26, 2, 4969