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: ['9931', 'f', 'I', '7761', '271', 'e', 'o', '3873', 'L', 'd', 'V', 'I', 'u', 'k', 'f', '4777', '9645', '5521', '7647', '7461', 'Q', 'b', 'u', 'W', '9055', '5111', '7515', '3865', '6727', '6837', 'f', '6125', 'x', '8835', 'K', '4621', '2053']

9931, 6, 9, 7761, 271, 5, 15, 3873, 12, 4, 22, 9, 21, 11, 6, 4777, 9645, 5521, 7647, 7461, 17, 2, 21, 23, 9055, 5111, 7515, 3865, 6727, 6837, 6, 6125, 24, 8835, 11, 4621, 2053