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: ['4345', '9921', 'f', 'T', 'X', '1235', '7975', 'z', '8137', 'F', 'm', '4747', '2161', 'I', '1093', 'q', '6527', '5219', 'x', 's', '131', '2567', '7867', '8811', '6863', 'i', '1365', 'S', '251']

4345, 9921, 6, 20, 24, 1235, 7975, 26, 8137, 6, 13, 4747, 2161, 9, 1093, 17, 6527, 5219, 24, 19, 131, 2567, 7867, 8811, 6863, 9, 1365, 19, 251