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: ['5423', '7729', 'F', 'r', '9517', '3917', 's', 'U', '7873', '6973', 'Q', 'x', '9537', 'e', '8461', 'P', '7061', '8033', '5517', '6015', '1375', '7383', '2357', '27', '6033', 'z', 'i', '9865', 'W', '4527']

5423, 7729, 6, 18, 9517, 3917, 19, 21, 7873, 6973, 17, 24, 9537, 5, 8461, 16, 7061, 8033, 5517, 6015, 1375, 7383, 2357, 27, 6033, 26, 9, 9865, 23, 4527