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: ['1371', 'L', 't', '2513', '4283', '7053']

1371, 12, 20, 2513, 4283, 7053