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: ['1293', '7435', 'r', '1043', 'k', 'z', '5565', '925', 'd', '4729', '6737', '3949', '8147', 'a', 'l', '6033', '625', '2949', 'q', '6705', 'd', 'r', 'U', '4157']

1293, 7435, 18, 1043, 11, 26, 5565, 925, 4, 4729, 6737, 3949, 8147, 1, 12, 6033, 625, 2949, 17, 6705, 4, 18, 21, 4157