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', 'B', 'p', 'C', 'U', '6253', 'u', 'B', 'U', '4597', '231', '2841', 'O', '385', 'Q', '67', 'z', 'V', '3665', 'H', 'N', 'H', 'y', '3751', 'g', '6295', 'E', 'P', 'o', '6003', 'j', '4517']

20, 2, 16, 3, 21, 6253, 21, 2, 21, 4597, 231, 2841, 15, 385, 17, 67, 26, 22, 3665, 8, 14, 8, 25, 3751, 7, 6295, 5, 16, 15, 6003, 10, 4517