Task: Program Execution
Input (English): 8, 10, ['x', '9879', '4427', 'E', '1485', '6567', 'd', '7733', 'u', 'w', '1893', 'S', 'f', '9015', '7775', '1737', '3965', '1957', '4947', '5423', 'c', '9415']
Output (English): wu7733