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: ['r', 'L', '5355', 'x', 'S', 'L', 'w', 'H', 'y', '8413', '9457', '3011', 'B', '7313', '5689', 'n', '7905', '9823', '3657', '7615', 'n', 'd', '1009', '3061', '6709', '9219', '6437', '4821', '8591', 'o', '1697', '4853', 'V', '6777', '315']

18, 12, 5355, 24, 19, 12, 23, 8, 25, 8413, 9457, 3011, 2, 7313, 5689, 14, 7905, 9823, 3657, 7615, 14, 4, 1009, 3061, 6709, 9219, 6437, 4821, 8591, 15, 1697, 4853, 22, 6777, 315