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: ['1379', 'R', 'i', '8405', 'l', 'P', '717', '4499', '6577', '7093', 'O', 'a', 't', '137', '6907', 'J', '7859', '6175', '1383', 'z', 'A', '259', 'P', 'g', 'C', '4641', 'S', 'J', '6035', 'N', 'L', '8797', '9105', 'u', 'l', 'u', '4027', 'n', 'S', 'V']

1379, 18, 9, 8405, 12, 16, 717, 4499, 6577, 7093, 15, 1, 20, 137, 6907, 10, 7859, 6175, 1383, 26, 1, 259, 16, 7, 3, 4641, 19, 10, 6035, 14, 12, 8797, 9105, 21, 12, 21, 4027, 14, 19, 22