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: ['7347', 'L', '7911', '2739', 'B', '6885', '3065', 'n', '1079', '4653', '369', '9997', '1883', 'W', 'T', '2775', '1327', 'X', '8139', 'I', '1001', 'n', 'W', '5623', '2489', '8203', '5489', '8281', 's', '5479', 'i', '8365', '487', 'P', '5449', 'C']

7347, 12, 7911, 2739, 2, 6885, 3065, 14, 1079, 4653, 369, 9997, 1883, 23, 20, 2775, 1327, 24, 8139, 9, 1001, 14, 23, 5623, 2489, 8203, 5489, 8281, 19, 5479, 9, 8365, 487, 16, 5449, 3