Task: Program Execution
Input (English): 4, 6, ['H', 'x', '9417', '2931', 'H', '557', 'Z', 'D', 'x', 'F', '6689', 'k', 'B', 'o', '7843', 'F', 'a', '8267', '5085', 'P', '297', '9563', '3545', '7337']
Output (English): 557H2931