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', '8453', '7447', 'S', 'L', '8451', '3687', 'l', 'c', '5815', '253', 'v', 'g', '4797']

14, 8453, 7447, 19, 12, 8451, 3687, 12, 3, 5815, 253, 22, 7, 4797