Task: Program Execution
Input (English): 4, 7, ['2677', 'W', 'Y', 'a', '227', 'Q', 'u', 'M', 'W', 'B', 'S', '8241', '7829', 'A', '4833', 'Z', 'c', 'E', 'C', '3027']
Output (English): a227Qu