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: ['2687', 'y', 'J', '1993', 'D', 'x', '309', '6665', 'Y', '7017', '9793', 'c', 'S', '3115', 'M', '369', 'q', '5739', 'e', '4821', 'V', 'u', 'p', 'g', 'b', '3797', '6883', 's', 'J', 's']

2687, 25, 10, 1993, 4, 24, 309, 6665, 25, 7017, 9793, 3, 19, 3115, 13, 369, 17, 5739, 5, 4821, 22, 21, 16, 7, 2, 3797, 6883, 19, 10, 19