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', '4697', '4857', 'w', '985', 'g', 'o', 'l', 'i', '7475', 'k', '6969', '2181', 'G', 't']

20, 4697, 4857, 23, 985, 7, 15, 12, 9, 7475, 11, 6969, 2181, 7, 20