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: ['1737', '9771', '5687', 'Z', 'B', 'a', 'u', '35', 'N', 't', 'W', '7869', 'c', 'D', 'i', '4787', '659', 'l', 'R', 'c', 'd', '3301', 'I', 'P', 'p', 'F', 'm', '7709', 'k', '1757', '8397', '9523']

1737, 9771, 5687, 26, 2, 1, 21, 35, 14, 20, 23, 7869, 3, 4, 9, 4787, 659, 12, 18, 3, 4, 3301, 9, 16, 16, 6, 13, 7709, 11, 1757, 8397, 9523