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: ['f', 'u', '3511', '1773', '7437', 'w', '1433', 'K', 'O', 'T', 'l', '299', 'E', 'h', 'w', '3563', 'H', '1523', 'M', 'S', '7357', 'j', '8741', '6833', '2645', '8529', '5751', 'G', '7875', 'm', 'x', '5177', '1489', 'F', '4491', '1709']

6, 21, 3511, 1773, 7437, 23, 1433, 11, 15, 20, 12, 299, 5, 8, 23, 3563, 8, 1523, 13, 19, 7357, 10, 8741, 6833, 2645, 8529, 5751, 7, 7875, 13, 24, 5177, 1489, 6, 4491, 1709