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: ['3739', '2345', '3901', '6103', 'X', '2259', 'p', '3179', '7967', 'u']

3739, 2345, 3901, 6103, 24, 2259, 16, 3179, 7967, 21