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: ['u', '1849', 'w', '5987', '8947', 'P', 'r', '7775', '7899', '1245', 'J', 'j', '6813', 'b', 'e', 'n', 'n', 'g', 'h', 'R', '5723', '2171', '231', '3827', '7101', '9355', '7091', 'N', '5985', '9305', '6971', 'F', '2633', '6611', 'M', 'X', '385', 'V']

21, 1849, 23, 5987, 8947, 16, 18, 7775, 7899, 1245, 10, 10, 6813, 2, 5, 14, 14, 7, 8, 18, 5723, 2171, 231, 3827, 7101, 9355, 7091, 14, 5985, 9305, 6971, 6, 2633, 6611, 13, 24, 385, 22