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: ['j', '5045', 'z', 'Y', '6153', 'b', 'f', 'Z', '7395', 'U', 'O', 'x']

10, 5045, 26, 25, 6153, 2, 6, 26, 7395, 21, 15, 24