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: ['4125', '1949', 'a', 'a', 'z', 't', '5833', '7255', '4881', '5883', '115', 'v', 'R', '787', '5421', 'F', 'e', 'M', '4337', '2875', '6423', '4491', 'T', '1843', '1247']

4125, 1949, 1, 1, 26, 20, 5833, 7255, 4881, 5883, 115, 22, 18, 787, 5421, 6, 5, 13, 4337, 2875, 6423, 4491, 20, 1843, 1247