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: ['8613', 'k', 'W', '1789', 'T', '253', 't', '2759', 'H', 'c', 'q', 'Y', '7825', '6727', 'w', 'k', '711', '2163', 'o']

8613, 11, 23, 1789, 20, 253, 20, 2759, 8, 3, 17, 25, 7825, 6727, 23, 11, 711, 2163, 15