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: ['6475', 'b', 'H', '6563', 'c', 'g', '6973', '7569', '7135', '5363', '1051']

6475, 2, 8, 6563, 3, 7, 6973, 7569, 7135, 5363, 1051