Task: Program Execution
Input (English): 4, 6, ['x', 'H', '4143', '5141', 'R', 'N', '6219', 'd', '5217', 'h', 'C', 'm', 'o', '9223', 'l', '57', 'H', 'l', 't', '6993', 'E', 'f', '6355', 'i', 'Q', '8177']
Output (English): NR5141