Task: Program Execution
Input (English): 17, 18, ['Q', '8251', 'B', '3185', 'q', '2879', 'Q', 'C', 'q', '9045', '6255', 'o', 'i', 'p', 'd', 'y', 'u', '9289', '8517', 'X', 'u', 'a', '479', 'b']
Output (English): u9289