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: ['N', '1437', 'Z', 's', 'C', '9409', '1513', '1283', '5301', '3519', '8403', '415', '9037', 'z', '4425', '9857', 'I', '2107', 'Z', '9633', '6941', '1269', '2885', '2461', 'a', 'i', '4875', '3385', '2955', 'I', 'U', 'f', 'y', 'P']

14, 1437, 26, 19, 3, 9409, 1513, 1283, 5301, 3519, 8403, 415, 9037, 26, 4425, 9857, 9, 2107, 26, 9633, 6941, 1269, 2885, 2461, 1, 9, 4875, 3385, 2955, 9, 21, 6, 25, 16