Task: Program Execution
Input (English): 4, ['B', 'E', '6241', '6893', '9097', 'd', '2237', 'B', 'D', 'k', 'k', '9863', 'W', '9303', '3041', '5515', 'q', '3017', '8893']
Output (English): B, E, 6241, 6893