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: ['2463', '9259', '4973', 'k', '8343', 'F', 'R', 'J', '6083', 'N', 'F', 't', 'L', '9195', 'f', '4521', 'k', '3461', '9137', 'o', 't', '7375', 'n', 'A', '3009', '3905', 'i', '4251']

2463, 9259, 4973, 11, 8343, 6, 18, 10, 6083, 14, 6, 20, 12, 9195, 6, 4521, 11, 3461, 9137, 15, 20, 7375, 14, 1, 3009, 3905, 9, 4251