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: ['9747', '207', '691', 'c', '4671', '4699', 't', 'S', 'l', '9749', 'x', '6853', 'd', 'N', 'F', '6565', 'D', '5539', 'W', 'f', 'u', 'a', 'g', 'R', '2479', '5691', '2429', 'j', 'j', 'q', '4895', '8363', 'l', '9529', '5249']

9747, 207, 691, 3, 4671, 4699, 20, 19, 12, 9749, 24, 6853, 4, 14, 6, 6565, 4, 5539, 23, 6, 21, 1, 7, 18, 2479, 5691, 2429, 10, 10, 17, 4895, 8363, 12, 9529, 5249