Task: Program Execution
Input (English): 4, 5, ['g', 'a', '7273', 'B', '9591', '6741', 'G', '2559', '7339', '9497', 'b', 'e', '6499', '1315', '8833', 'U', 'w', '1143', '5103', 'a', 'f']
Output (English): B9591