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: ['Z', '4203', '2161', 't', '9957', 'A', 'Z', 'N', 'u', 'Y', '9375', '5067', '7627', '5237', '1261']

26, 4203, 2161, 20, 9957, 1, 26, 14, 21, 25, 9375, 5067, 7627, 5237, 1261