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: ['7741', 'u', '7193', '8065', '3069', 'C', '4727', '9983', '2525', 't', '2819', '9823', '6269', 'u', 'E', '8839', '667', '153', 'K', 'F', '5665', '3421', '1211', 'k', 'z', '139', '8475', 'N', '4435', 'y']

7741, 21, 7193, 8065, 3069, 3, 4727, 9983, 2525, 20, 2819, 9823, 6269, 21, 5, 8839, 667, 153, 11, 6, 5665, 3421, 1211, 11, 26, 139, 8475, 14, 4435, 25