Task: Program Execution
Input (English): 4, 20, ['c', '6561', '6103', '6739', '5747', 'B', 'X', 'c', 'e', '1989', 'r', '3911', '3587', '7815', '931', '6463', '5373', 'D', 'D', '2105', 'R', '5145', '6109', '1421']
Output (English): 2105, D, D, 5373, 6463, 931, 7815, 3587, 3911, r, 1989, e, c, X, B, 5747, 6739