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: ['b', '1379', '9825', '3255', 'j', 'G', '2131', 'z', 'K', 'V', 'K', '7455', 'u', '8243']

2, 1379, 9825, 3255, 10, 7, 2131, 26, 11, 22, 11, 7455, 21, 8243