Task: Program Execution
Input (English): 20, 21, ['7441', '1849', '8067', '1595', '2165', 'p', '6773', 'C', '393', '2673', '6745', 'r', '9047', '9575', '2137', 'u', '2923', 'J', 'l', 'L', 'r', 'c', '1779', '7517', '3819']
Output (English): Lr