Task: Program Execution
Input (English): 1, 7, ['9403', 'a', '3185', '8587', 'u', 'h', '8743', 'P', '2331', 'r', 'C', 'C', 'B', 'U', '2789', '2571', '2815']
Output (English): 9403a31858587uh8743