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: ['j', '1489', '4249', 'Y', 'n', '5405', 'q', 'n', '3845', 'r', '4649', 'P', 'z', 'b', 'l', '9105', 'n', 'l', 'J', 't', 'l', 'X', 'J', 'K', 'o', 'v', 'g', '1651', 'Z', 't', 'H', '9021', '6689', '4047', '475', 'A', '6707', '8913', '5363', 'O']

10, 1489, 4249, 25, 14, 5405, 17, 14, 3845, 18, 4649, 16, 26, 2, 12, 9105, 14, 12, 10, 20, 12, 24, 10, 11, 15, 22, 7, 1651, 26, 20, 8, 9021, 6689, 4047, 475, 1, 6707, 8913, 5363, 15