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: ['B', 'l', 'Y', '2137', '8249', '6831', 'w', 'V', 'v', 't', 'r', '5371', '1825', '8587', '2339', '3595', '5101', '5685', '1351', '4343', '8687', '1377', 'O', 'e', '3443', '3529', '261', '4833', '2715', '7763', '1997', 'E', 'w', 'I', '4145', 'f', 'm', '2633', '6135', '2653']

2, 12, 25, 2137, 8249, 6831, 23, 22, 22, 20, 18, 5371, 1825, 8587, 2339, 3595, 5101, 5685, 1351, 4343, 8687, 1377, 15, 5, 3443, 3529, 261, 4833, 2715, 7763, 1997, 5, 23, 9, 4145, 6, 13, 2633, 6135, 2653