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: ['T', 'i', '4657', '5175', 'K', '5771', 'k', 'u', 'l', 'n', '787', '9325', '2757', 'Y', 't', '3409']

20, 9, 4657, 5175, 11, 5771, 11, 21, 12, 14, 787, 9325, 2757, 25, 20, 3409