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: ['7261', '7121', '2789', '8429', 'c', 'I', 'P', 'o', 'i', 'F']

7261, 7121, 2789, 8429, 3, 9, 16, 15, 9, 6