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: ['N', 'Q', '9621', '1067', '9399', 'D', '5623', 'o', 'P', '4791', 'a', 'u', '7613', '4543', 'P', '1509', 'p', 'B', '2501', 'f', '907', 'p', 'K', 'K', '1087', '969', 'T', 'J', 'j', 'x']

14, 17, 9621, 1067, 9399, 4, 5623, 15, 16, 4791, 1, 21, 7613, 4543, 16, 1509, 16, 2, 2501, 6, 907, 16, 11, 11, 1087, 969, 20, 10, 10, 24