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: ['6781', '5695', 'p', '2761', '5077', '4971', 'z', 'b', '5833', '5687', 'x', 'W', '8085', '3115', 'S', 'E', 'Z', '2287', 'q', 'G', '203', 'J', '9931', 'v', '7099', 'U', 'k', '8779', '2111', '4019', '4863', '137', 'R', 'Y', '9269', 'X', 'N', '3731', 'l', 'W']

6781, 5695, 16, 2761, 5077, 4971, 26, 2, 5833, 5687, 24, 23, 8085, 3115, 19, 5, 26, 2287, 17, 7, 203, 10, 9931, 22, 7099, 21, 11, 8779, 2111, 4019, 4863, 137, 18, 25, 9269, 24, 14, 3731, 12, 23