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: ['s', '7687', 'S', '4325', '1321', '6821', '3215', 't', '9523', 'r', '2955', 'H', '6907', 'E', 'r', '9773', 'O', 'c', '9337', 't', 'P', 'P', 'o', 'F', '3647', 'c', '4647', '6423', '119', 'M', '4483', '5203', 'x', 'a', '1929', 'o', '9187']

19, 7687, 19, 4325, 1321, 6821, 3215, 20, 9523, 18, 2955, 8, 6907, 5, 18, 9773, 15, 3, 9337, 20, 16, 16, 15, 6, 3647, 3, 4647, 6423, 119, 13, 4483, 5203, 24, 1, 1929, 15, 9187