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: ['1685', 'g', '3487', 'M', 'a', '685', 'K', '6965', 'l', 'i', 'H', 'M', '5201', 'K', '375', 'U', 'S', '2189', '7559', '6337', 'p', '6565', '7075', '4601', 'z', '1413', '4955', '8045', '8251', '1995', '2553', '3855', 'u', '1891']

1685, 7, 3487, 13, 1, 685, 11, 6965, 12, 9, 8, 13, 5201, 11, 375, 21, 19, 2189, 7559, 6337, 16, 6565, 7075, 4601, 26, 1413, 4955, 8045, 8251, 1995, 2553, 3855, 21, 1891