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: ['1369', 'B', 'p', 'U', '1107', '5187', '5347', 'T']

1369, 2, 16, 21, 1107, 5187, 5347, 20