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: ['2131', 't', 'M', '1995', 'm', 'S', '6353']

2131, 20, 13, 1995, 13, 19, 6353