Task: Program Execution
Input (English): 13, 15, ['L', 'O', '2407', 'W', '2159', 'P', 'c', 'E', '1431', 'y', '5833', '1289', '8625', 'S', '6873', 'C', '431', 'F', '5261', 'b', '8783', 'H', '4147', '7071']
Output (English): 6873S8625