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: ['7527', 'M', '4923', '5123', 'W', 'R', '7297']

7527, 13, 4923, 5123, 23, 18, 7297