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: ['t', '8541', '3521', 'n', 'V', '1285', '7491', '7487', 'L', '6657', 'o', '3223', '3979', 'l', '4173', '1279', '3227', 'g', '437', '2639', 'c', 'h', 'd', 'X', 'V', '5899', 'a', '8199', '9737', '3431', 'f', '8309', 'C', '4885', '7897', 'E', '6857']

20, 8541, 3521, 14, 22, 1285, 7491, 7487, 12, 6657, 15, 3223, 3979, 12, 4173, 1279, 3227, 7, 437, 2639, 3, 8, 4, 24, 22, 5899, 1, 8199, 9737, 3431, 6, 8309, 3, 4885, 7897, 5, 6857