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', '3443', 'E', 't', 'F', 'd', 'w', 'P', '3751', '3613', '217', 'e', '7421', '9255', '7817', 'i', '7017', 'q', 'v', '8555', 'z', 'r', '4345']

4, 3443, 5, 20, 6, 4, 23, 16, 3751, 3613, 217, 5, 7421, 9255, 7817, 9, 7017, 17, 22, 8555, 26, 18, 4345