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: ['1455', 'W', '9565', 'e', '7759', '7859', 'o', 'i', 'x', 'h', '7297', '9825', 'L', '179', '6023', '9621', 'W', '397', 'i', 'x', 'A', '6177', 't', 't', '8733', 'e', 'W', '153']

1455, 23, 9565, 5, 7759, 7859, 15, 9, 24, 8, 7297, 9825, 12, 179, 6023, 9621, 23, 397, 9, 24, 1, 6177, 20, 20, 8733, 5, 23, 153