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.

['1107', 'C', '5921', '7815', '1509', 'l']
1107, 3, 5921, 7815, 1509, 12

['b', 'y', '2013', '5323', '889', '6257', '8113', '6951', '9563', '8935', '6437', 'S', '5973', '2609', '2855', 'J', 'Z', '629', '7687', '8481', '2673', 'B', 'S']
2, 25, 2013, 5323, 889, 6257, 8113, 6951, 9563, 8935, 6437, 19, 5973, 2609, 2855, 10, 26, 629, 7687, 8481, 2673, 2, 19

['x', '8157', '5007', '7075', '8585', '8095', 'I', 'n', '3005', 'O', 'j', '6443', '7245', '3713', 'N', '8617', '1123', 'S', '9847', '4171', '4655', 'j', '1869', 'g', '9013', '9209', '7913', 'a', '337', 't', 'c']

24, 8157, 5007, 7075, 8585, 8095, 9, 14, 3005, 15, 10, 6443, 7245, 3713, 14, 8617, 1123, 19, 9847, 4171, 4655, 10, 1869, 7, 9013, 9209, 7913, 1, 337, 20, 3