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: ['7797', 'U', '3575', '3633', 'm', '8657', 'h', '9005', 'R', 'Q', '2355', '5461', 'x', 'M', '719', 'R', '6527', '4223', 'V', 's', 'I', '8887', '6993', 'A', 'M', '1141', '6713', 'L', '1213', 'P', '9805', '1115', '7759', 'b', 'E', '6243', '9809']

7797, 21, 3575, 3633, 13, 8657, 8, 9005, 18, 17, 2355, 5461, 24, 13, 719, 18, 6527, 4223, 22, 19, 9, 8887, 6993, 1, 13, 1141, 6713, 12, 1213, 16, 9805, 1115, 7759, 2, 5, 6243, 9809