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: ['1935', 'B', 't', 'C', 'n', 'J', '9243', '2163', 'i', 's', '8709', '6379', '3369', 'm', '797', '9309', '7873', 'y', '5847', '1913', '3349']

1935, 2, 20, 3, 14, 10, 9243, 2163, 9, 19, 8709, 6379, 3369, 13, 797, 9309, 7873, 25, 5847, 1913, 3349