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: ['N', '9121', 'E', 'x', '4691', '3629', 'h', 'c', 'A', 'y', '789', 'n', 't', '9245', '7931', '6071', 'G', '4345', 'a', 'U', '6285', 'J', '9085', 'J', 'u', 'Z', '3593', '2873', 'p', '2603', '4543', '4773', '1199', 'W', 'j', '8945', 'H', '2805']

14, 9121, 5, 24, 4691, 3629, 8, 3, 1, 25, 789, 14, 20, 9245, 7931, 6071, 7, 4345, 1, 21, 6285, 10, 9085, 10, 21, 26, 3593, 2873, 16, 2603, 4543, 4773, 1199, 23, 10, 8945, 8, 2805