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: ['7087', 'P', 'V', '7507', '5723', 'T', 'l', '5671', 'i', 'e', '8789', '2131', 'Q', '807', 'x', '7215', '4525', 'f', '5247', '1903', 'x', '1525', '9449', '9361', '8915', 'x', 'K', 'R']

7087, 16, 22, 7507, 5723, 20, 12, 5671, 9, 5, 8789, 2131, 17, 807, 24, 7215, 4525, 6, 5247, 1903, 24, 1525, 9449, 9361, 8915, 24, 11, 18