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: ['1945', 'm', 'N', '6067', '3705', '557', 'R', 'T', 'a', 'Q', 'F', '2279', '5359', '2393', '5921', 'u', '7607']

1945, 13, 14, 6067, 3705, 557, 18, 20, 1, 17, 6, 2279, 5359, 2393, 5921, 21, 7607