Task: Program Execution
Input (English): 2, ['J', 'R', '1425', 'u', '6551', '1989', 'E', '1423', '6255', '8893', '8391', 'X', 'M', '2901', '5875', '447', '4435', 'x', '2439', '9149', 'E', 'w', 'f', 'F', 'H']
Output (English): J, R