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: ['1183', '4279', 'f', 'I', 'I', '3533', '891', 'z', '5947', '8717', '6875', '7121', '3503', 'l', '1909', 'E', '6613', '5571', 's', 'R', 'e']

1183, 4279, 6, 9, 9, 3533, 891, 26, 5947, 8717, 6875, 7121, 3503, 12, 1909, 5, 6613, 5571, 19, 18, 5