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: ['Y', 'p', '6139', '5769', 'K', '2895', 'U', '5979', '4037', 'v', '5251', 'w', '4411', '8787', 'f', '745', '2129', 'M', '6063', '1249', '9281', '1657', '7965', 'N', '3897', 'C', 'A', 'C', 'g', '7379', '1717', '7699', '9195', 'd', 'm', '6465', 'H', 'r', '6217']

25, 16, 6139, 5769, 11, 2895, 21, 5979, 4037, 22, 5251, 23, 4411, 8787, 6, 745, 2129, 13, 6063, 1249, 9281, 1657, 7965, 14, 3897, 3, 1, 3, 7, 7379, 1717, 7699, 9195, 4, 13, 6465, 8, 18, 6217