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: ['D', 'P', '9785', 'D', 'X', '6857', '6313', 'j', 'f', '3955', 'C', '8111', 'K', 'f', '4599', 'm', '779', 'n', '1383', '4623']

4, 16, 9785, 4, 24, 6857, 6313, 10, 6, 3955, 3, 8111, 11, 6, 4599, 13, 779, 14, 1383, 4623