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.

['2515', 'a', 'e', 'n', '281', 'I', 'S', '8307', '3617', '6139', 'H', 'L', 'J', '4055', '9429', '5329', '9301', '2151', '5207', '1449', '4825', 'B', '7715', '4913', 'N', 'U', '9125', 'Y', '4343', 'R', 'x', 'f', '8727', '4801', 'G', 'x', '1377', '857', 'R', 'O']
2515, 1, 5, 14, 281, 9, 19, 8307, 3617, 6139, 8, 12, 10, 4055, 9429, 5329, 9301, 2151, 5207, 1449, 4825, 2, 7715, 4913, 14, 21, 9125, 25, 4343, 18, 24, 6, 8727, 4801, 7, 24, 1377, 857, 18, 15

['G', 'O', '8921', 'k', 'T', 'g', '9349', '2977', '143', '2743', '7843']
7, 15, 8921, 11, 20, 7, 9349, 2977, 143, 2743, 7843

['7669', 'C', 'J', 'y', 'x', '6883', 'd', 'C', '6369', '8913', 'w', '1185', 'i', 'M', 'U', 'H', '5277', 'P', '4357', 'q', '8155']

7669, 3, 10, 25, 24, 6883, 4, 3, 6369, 8913, 23, 1185, 9, 13, 21, 8, 5277, 16, 4357, 17, 8155