Task: Program Execution
Input (English): 15, 18, ['x', '4357', 'W', '9513', '2749', 'Q', '5547', 'y', '527', '2519', 'H', 'G', 'F', 'T', 'U', 'i', 'o', 'R', '765', '817', '3891', 'g', '9215']
Output (English): UioR