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: ['1129', '975', '4103', '3067', '7025', '6213', 'T', 'x', '5281', '9457', 'E', 'W', '8553', '7165', '8879', '1699', '6667', 'o', '6339', 'd', 'y', 'Z', '9455']

1129, 975, 4103, 3067, 7025, 6213, 20, 24, 5281, 9457, 5, 23, 8553, 7165, 8879, 1699, 6667, 15, 6339, 4, 25, 26, 9455