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: ['i', '5123', '9321', '6483', 'A', '9075', '1045', 'n', 'u', '9171', '7803', '6103', '2421', 'N', 'e', 'j', 'P', '6647', 'S', 'n', 'Z', '4845', 'l', '3307', '7537', '4867', 'H']

9, 5123, 9321, 6483, 1, 9075, 1045, 14, 21, 9171, 7803, 6103, 2421, 14, 5, 10, 16, 6647, 19, 14, 26, 4845, 12, 3307, 7537, 4867, 8