Task: Program Execution
Input (English): 7, 18, ['7333', 'X', 'Y', '971', 'U', 'h', 'B', 'a', 'T', 'o', 'n', 'Y', 'z', 'z', 'a', 'Z', '2397', 'X', 'S']
Output (English): BaTonYzzaZ2397X