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', 'f', 'B', '3129', 'k', 'M', 'S', 'U', 's', 'b', '4921', '9203', 'x', 't', 'A', '5077', 'I', 'Q', 'f', 'V', 'n', 'd', '6855', '423', '1421', 'c', 'J', 'H']

20, 6, 2, 3129, 11, 13, 19, 21, 19, 2, 4921, 9203, 24, 20, 1, 5077, 9, 17, 6, 22, 14, 4, 6855, 423, 1421, 3, 10, 8