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.

['3815', '6963', '1481', 'i', 'N', 'S', '1029', '3511', 'H', 'M', '2701', '8769', '1927']
3815, 6963, 1481, 9, 14, 19, 1029, 3511, 8, 13, 2701, 8769, 1927

['Q', 'r', 'R', '7979', '881', '9607', 'v', 'C', '5337', 'd', '287', 'i', 't', 'R', 'S', '5257', 'p', 'a', 'F', 'v', 'Q', 'S', 'u', 'o', '3137', 'B', '5975', '2127', '8831', 'w', 'N', '751']
17, 18, 18, 7979, 881, 9607, 22, 3, 5337, 4, 287, 9, 20, 18, 19, 5257, 16, 1, 6, 22, 17, 19, 21, 15, 3137, 2, 5975, 2127, 8831, 23, 14, 751

['1819', 'F', 'A', 'i', 'K', 'x', '1471', '7597', 'c', '8749', 'Y', 'Z', 'L', 'q', 'U', '8125', 'u', 'b']

1819, 6, 1, 9, 11, 24, 1471, 7597, 3, 8749, 25, 26, 12, 17, 21, 8125, 21, 2