Task: Program Execution
Input (English): 7, 21, ['9435', '3105', 's', 'y', '5587', '3687', 'D', 'R', 'L', '9693', 'z', '3041', 'g', '903', 'J', '3579', '9843', 'O', '9709', '5965', 'J', '561', '2173', 'u', '399', 'f']
Output (English): DRL9693z3041g903J35799843O97095965J