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: ['E', '6237', '4159', 'i', 'c', '3955', 'E', 'W', '8855', '653']

5, 6237, 4159, 9, 3, 3955, 5, 23, 8855, 653