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: ['1437', 's', '7123', 't', 'o', 'P', '7029', '8833', '9163', 'j', '6091', 'E', 'U', '2145', 'j', '4287', '3347', '6891', 'N', 'r', '721', 'Y', '6029', 'Z', 'Q', 'F', '819', 'c', '2677', 'y', 'O', '6663']

1437, 19, 7123, 20, 15, 16, 7029, 8833, 9163, 10, 6091, 5, 21, 2145, 10, 4287, 3347, 6891, 14, 18, 721, 25, 6029, 26, 17, 6, 819, 3, 2677, 25, 15, 6663