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: ['S', '1581', 'R', '8505', '1167', '6157', '4247', 'f', '735', 'K', 'C', 'k', '6425', 'X', 'L', '1233', 'c', '3615', '471', '5895', 'Y', 'k', 'P', 'w', '329', 'Q', 'R', 'y', '1639', 'r', '5639', 'R', 'b', '8505', 's', '1515', '3011', 'o', 's', '4469']

19, 1581, 18, 8505, 1167, 6157, 4247, 6, 735, 11, 3, 11, 6425, 24, 12, 1233, 3, 3615, 471, 5895, 25, 11, 16, 23, 329, 17, 18, 25, 1639, 18, 5639, 18, 2, 8505, 19, 1515, 3011, 15, 19, 4469