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: ['J', 'P', 'g', '21', 'r', 'W', 'r', 'L', 'R', 'Q', 'l', 'e', 'L', 'D', 'a', '1517', 'n', '7069', '9881', 'Z', '8287', 'n', '503', '2741', '1335', '4211', 'i', 'P', '3945', '8265', 'q', '6989', 'w', '6991', '1017', 'M', '4123', 'Z', 'q', '1929']

10, 16, 7, 21, 18, 23, 18, 12, 18, 17, 12, 5, 12, 4, 1, 1517, 14, 7069, 9881, 26, 8287, 14, 503, 2741, 1335, 4211, 9, 16, 3945, 8265, 17, 6989, 23, 6991, 1017, 13, 4123, 26, 17, 1929