Task: Program Execution
Input (English): 4, 19, ['2647', '3577', '7489', '5179', '6571', 't', '8645', 'F', 'K', '1771', '8309', 'x', 's', 'x', '517', '5451', 'R', 'X', '4109', '6743', 'r', 'o', '5087', '4149', 'r', '2501', 'J']
Output (English): 51796571t8645FK17718309xsx5175451RX4109