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: ['3205', 'J', '2997', 'X', '6461', 'R', 'b', 'F', 'U', '4213', '9147', '3305', 'N', '401', '3953', '6063', '3329', '9509', 'P', '3923', '4497', '1721', '7797', 'E', '1997', '8227', '3787', '9133', 'u', 'C', '6925', 'd', 'S', '8431', '5041']

3205, 10, 2997, 24, 6461, 18, 2, 6, 21, 4213, 9147, 3305, 14, 401, 3953, 6063, 3329, 9509, 16, 3923, 4497, 1721, 7797, 5, 1997, 8227, 3787, 9133, 21, 3, 6925, 4, 19, 8431, 5041