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: ['2941', '6311', 'l', 'J', '3667', '2603', '4653', '4383', 'F', '8511', 'V', 'u', '9001', 'H', '7587', 'L', 'b', 'M', '7739', 'v', '6017', 'K', 'g', '5711', 'D', 'i', '769', 'e', 'B', '6933', '3875', 'R']

2941, 6311, 12, 10, 3667, 2603, 4653, 4383, 6, 8511, 22, 21, 9001, 8, 7587, 12, 2, 13, 7739, 22, 6017, 11, 7, 5711, 4, 9, 769, 5, 2, 6933, 3875, 18