Task: Program Execution
Input (English): 2, 20, ['v', 'B', '2287', '1923', 'C', '8477', '4115', '803', '6579', 'u', 'x', 'b', 'J', '4007', '3505', 'M', 'g', 'Z', '2887', 'U', 'S', 'Y', 'i']
Output (English): B22871923C847741158036579uxbJ40073505MgZ2887U