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: ['7861', 'w', '6163', 'e', 'u', '1819', '2417', 'a', '7763', '559', '3325', '8977', '4733', 'p', '329', 'h', 'O', 'Y', 'G', '8725', 'q', 'E', '8437', 'Y', 'k', 'z', 'l', '7903', 'F']

7861, 23, 6163, 5, 21, 1819, 2417, 1, 7763, 559, 3325, 8977, 4733, 16, 329, 8, 15, 25, 7, 8725, 17, 5, 8437, 25, 11, 26, 12, 7903, 6