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: ['7337', 'A', '6487', 'G', '1303', 'N', '9769', '9749', '1739', '1653', 'S', '6655', 'D', 'c', '3969', 'k', 's']

7337, 1, 6487, 7, 1303, 14, 9769, 9749, 1739, 1653, 19, 6655, 4, 3, 3969, 11, 19